diff --git a/webgui/3rdparty/pagedown/LICENSE.txt b/webgui/3rdparty/pagedown/LICENSE.txt
new file mode 100644
index 000000000..dbb4adef7
--- /dev/null
+++ b/webgui/3rdparty/pagedown/LICENSE.txt
@@ -0,0 +1,32 @@
+A javascript port of Markdown, as used on Stack Overflow
+and the rest of Stack Exchange network.
+
+Largely based on showdown.js by John Fraser (Attacklab).
+
+Original Markdown Copyright (c) 2004-2005 John Gruber
+  <http://daringfireball.net/projects/markdown/>
+
+
+Original Showdown code copyright (c) 2007 John Fraser
+
+Modifications and bugfixes (c) 2009 Dana Robinson
+Modifications and bugfixes (c) 2009-2014 Stack Exchange Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
diff --git a/webgui/3rdparty/pagedown/Markdown.Converter.js b/webgui/3rdparty/pagedown/Markdown.Converter.js
new file mode 100644
index 000000000..91d522899
--- /dev/null
+++ b/webgui/3rdparty/pagedown/Markdown.Converter.js
@@ -0,0 +1,1627 @@
+"use strict";
+var Markdown;
+
+if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module
+    Markdown = exports;
+else
+    Markdown = {};
+
+// The following text is included for historical reasons, but should
+// be taken with a pinch of salt; it's not all true anymore.
+
+//
+// Wherever possible, Showdown is a straight, line-by-line port
+// of the Perl version of Markdown.
+//
+// This is not a normal parser design; it's basically just a
+// series of string substitutions.  It's hard to read and
+// maintain this way,  but keeping Showdown close to the original
+// design makes it easier to port new features.
+//
+// More importantly, Showdown behaves like markdown.pl in most
+// edge cases.  So web applications can do client-side preview
+// in Javascript, and then build identical HTML on the server.
+//
+// This port needs the new RegExp functionality of ECMA 262,
+// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
+// should do fine.  Even with the new regular expression features,
+// We do a lot of work to emulate Perl's regex functionality.
+// The tricky changes in this file mostly have the "attacklab:"
+// label.  Major or self-explanatory changes don't.
+//
+// Smart diff tools like Araxis Merge will be able to match up
+// this file with markdown.pl in a useful way.  A little tweaking
+// helps: in a copy of markdown.pl, replace "#" with "//" and
+// replace "$text" with "text".  Be sure to ignore whitespace
+// and line endings.
+//
+
+
+//
+// Usage:
+//
+//   var text = "Markdown *rocks*.";
+//
+//   var converter = new Markdown.Converter();
+//   var html = converter.makeHtml(text);
+//
+//   alert(html);
+//
+// Note: move the sample code to the bottom of this
+// file before uncommenting it.
+//
+
+(function () {
+
+    function identity(x) { return x; }
+    function returnFalse(x) { return false; }
+
+    function HookCollection() { }
+
+    HookCollection.prototype = {
+
+        chain: function (hookname, func) {
+            var original = this[hookname];
+            if (!original)
+                throw new Error("unknown hook " + hookname);
+
+            if (original === identity)
+                this[hookname] = func;
+            else
+                this[hookname] = function (text) {
+                    var args = Array.prototype.slice.call(arguments, 0);
+                    args[0] = original.apply(null, args);
+                    return func.apply(null, args);
+                };
+        },
+        set: function (hookname, func) {
+            if (!this[hookname])
+                throw new Error("unknown hook " + hookname);
+            this[hookname] = func;
+        },
+        addNoop: function (hookname) {
+            this[hookname] = identity;
+        },
+        addFalse: function (hookname) {
+            this[hookname] = returnFalse;
+        }
+    };
+
+    Markdown.HookCollection = HookCollection;
+
+    // g_urls and g_titles allow arbitrary user-entered strings as keys. This
+    // caused an exception (and hence stopped the rendering) when the user entered
+    // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this
+    // (since no builtin property starts with "s_"). See
+    // http://meta.stackexchange.com/questions/64655/strange-wmd-bug
+    // (granted, switching from Array() to Object() alone would have left only __proto__
+    // to be a problem)
+    function SaveHash() { }
+    SaveHash.prototype = {
+        set: function (key, value) {
+            this["s_" + key] = value;
+        },
+        get: function (key) {
+            return this["s_" + key];
+        }
+    };
+
+    Markdown.Converter = function (OPTIONS) {
+        var pluginHooks = this.hooks = new HookCollection();
+        
+        // given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link
+        pluginHooks.addNoop("plainLinkText");
+        
+        // called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked
+        pluginHooks.addNoop("preConversion");
+        
+        // called with the text once all normalizations have been completed (tabs to spaces, line endings, etc.), but before any conversions have
+        pluginHooks.addNoop("postNormalization");
+        
+        // Called with the text before / after creating block elements like code blocks and lists. Note that this is called recursively
+        // with inner content, e.g. it's called with the full text, and then only with the content of a blockquote. The inner
+        // call will receive outdented text.
+        pluginHooks.addNoop("preBlockGamut");
+        pluginHooks.addNoop("postBlockGamut");
+        
+        // called with the text of a single block element before / after the span-level conversions (bold, code spans, etc.) have been made
+        pluginHooks.addNoop("preSpanGamut");
+        pluginHooks.addNoop("postSpanGamut");
+        
+        // called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml
+        pluginHooks.addNoop("postConversion");
+
+        //
+        // Private state of the converter instance:
+        //
+
+        // Global hashes, used by various utility routines
+        var g_urls;
+        var g_titles;
+        var g_html_blocks;
+
+        // Used to track when we're inside an ordered or unordered list
+        // (see _ProcessListItems() for details):
+        var g_list_level;
+        
+        OPTIONS = OPTIONS || {};
+        var asciify = identity, deasciify = identity;
+        if (OPTIONS.nonAsciiLetters) {
+
+            /* In JavaScript regular expressions, \w only denotes [a-zA-Z0-9_].
+             * That's why there's inconsistent handling e.g. with intra-word bolding
+             * of Japanese words. That's why we do the following if OPTIONS.nonAsciiLetters
+             * is true:
+             *
+             * Before doing bold and italics, we find every instance
+             * of a unicode word character in the Markdown source that is not
+             * matched by \w, and the letter "Q". We take the character's code point
+             * and encode it in base 51, using the "digits"
+             *
+             *     A, B, ..., P, R, ..., Y, Z, a, b, ..., y, z
+             *
+             * delimiting it with "Q" on both sides. For example, the source
+             *
+             * > In Chinese, the smurfs are called 藍精靈, meaning "blue spirits".
+             *
+             * turns into
+             *
+             * > In Chinese, the smurfs are called QNIhQQMOIQQOuUQ, meaning "blue spirits".
+             *
+             * Since everything that is a letter in Unicode is now a letter (or
+             * several letters) in ASCII, \w and \b should always do the right thing.
+             *
+             * After the bold/italic conversion, we decode again; since "Q" was encoded
+             * alongside all non-ascii characters (as "QBfQ"), and the conversion
+             * will not generate "Q", the only instances of that letter should be our
+             * encoded characters. And since the conversion will not break words, the
+             * "Q...Q" should all still be in one piece.
+             *
+             * We're using "Q" as the delimiter because it's probably one of the
+             * rarest characters, and also because I can't think of any special behavior
+             * that would ever be triggered by this letter (to use a silly example, if we
+             * delimited with "H" on the left and "P" on the right, then "Ψ" would be
+             * encoded as "HTTP", which may cause special behavior). The latter would not
+             * actually be a huge issue for bold/italic, but may be if we later use it
+             * in other places as well.
+             * */            
+            (function () {
+                var lettersThatJavaScriptDoesNotKnowAndQ = /[Q\u00aa\u00b5\u00ba\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376-\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0523\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0621-\u064a\u0660-\u0669\u066e-\u066f\u0671-\u06d3\u06d5\u06e5-\u06e6\u06ee-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07c0-\u07ea\u07f4-\u07f5\u07fa\u0904-\u0939\u093d\u0950\u0958-\u0961\u0966-\u096f\u0971-\u0972\u097b-\u097f\u0985-\u098c\u098f-\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc-\u09dd\u09df-\u09e1\u09e6-\u09f1\u0a05-\u0a0a\u0a0f-\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32-\u0a33\u0a35-\u0a36\u0a38-\u0a39\u0a59-\u0a5c\u0a5e\u0a66-\u0a6f\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2-\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0-\u0ae1\u0ae6-\u0aef\u0b05-\u0b0c\u0b0f-\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32-\u0b33\u0b35-\u0b39\u0b3d\u0b5c-\u0b5d\u0b5f-\u0b61\u0b66-\u0b6f\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99-\u0b9a\u0b9c\u0b9e-\u0b9f\u0ba3-\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0be6-\u0bef\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58-\u0c59\u0c60-\u0c61\u0c66-\u0c6f\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0-\u0ce1\u0ce6-\u0cef\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d28\u0d2a-\u0d39\u0d3d\u0d60-\u0d61\u0d66-\u0d6f\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32-\u0e33\u0e40-\u0e46\u0e50-\u0e59\u0e81-\u0e82\u0e84\u0e87-\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa-\u0eab\u0ead-\u0eb0\u0eb2-\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0ed0-\u0ed9\u0edc-\u0edd\u0f00\u0f20-\u0f29\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8b\u1000-\u102a\u103f-\u1049\u1050-\u1055\u105a-\u105d\u1061\u1065-\u1066\u106e-\u1070\u1075-\u1081\u108e\u1090-\u1099\u10a0-\u10c5\u10d0-\u10fa\u10fc\u1100-\u1159\u115f-\u11a2\u11a8-\u11f9\u1200-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u1676\u1681-\u169a\u16a0-\u16ea\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u17e0-\u17e9\u1810-\u1819\u1820-\u1877\u1880-\u18a8\u18aa\u1900-\u191c\u1946-\u196d\u1970-\u1974\u1980-\u19a9\u19c1-\u19c7\u19d0-\u19d9\u1a00-\u1a16\u1b05-\u1b33\u1b45-\u1b4b\u1b50-\u1b59\u1b83-\u1ba0\u1bae-\u1bb9\u1c00-\u1c23\u1c40-\u1c49\u1c4d-\u1c7d\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u203f-\u2040\u2054\u2071\u207f\u2090-\u2094\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2183-\u2184\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2c6f\u2c71-\u2c7d\u2c80-\u2ce4\u2d00-\u2d25\u2d30-\u2d65\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3006\u3031-\u3035\u303b-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31b7\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fc3\ua000-\ua48c\ua500-\ua60c\ua610-\ua62b\ua640-\ua65f\ua662-\ua66e\ua67f-\ua697\ua717-\ua71f\ua722-\ua788\ua78b-\ua78c\ua7fb-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8d0-\ua8d9\ua900-\ua925\ua930-\ua946\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa50-\uaa59\uac00-\ud7a3\uf900-\ufa2d\ufa30-\ufa6a\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40-\ufb41\ufb43-\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe33-\ufe34\ufe4d-\ufe4f\ufe70-\ufe74\ufe76-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]/g;
+                var cp_Q = "Q".charCodeAt(0);
+                var cp_A = "A".charCodeAt(0);
+                var cp_Z = "Z".charCodeAt(0);
+                var dist_Za = "a".charCodeAt(0) - cp_Z - 1;
+                
+                asciify = function(text) {
+                    return text.replace(lettersThatJavaScriptDoesNotKnowAndQ, function (m) {
+                        var c = m.charCodeAt(0);
+                        var s = "";
+                        var v;
+                        while (c > 0) {
+                            v = (c % 51) + cp_A;
+                            if (v >= cp_Q)
+                                v++;
+                            if (v > cp_Z)
+                                v += dist_Za;
+                            s = String.fromCharCode(v) + s;
+                            c = c / 51 | 0;
+                        }
+                        return "Q" + s + "Q";
+                    })
+                };
+                
+                deasciify = function(text) {
+                    return text.replace(/Q([A-PR-Za-z]{1,3})Q/g, function (m, s) {
+                        var c = 0;
+                        var v;
+                        for (var i = 0; i < s.length; i++) {
+                            v = s.charCodeAt(i);
+                            if (v > cp_Z)
+                                v -= dist_Za;
+                            if (v > cp_Q)
+                                v--;
+                            v -= cp_A;
+                            c = (c * 51) + v;
+                        }
+                        return String.fromCharCode(c);
+                    })
+                }                
+            })();
+        }
+        
+        var _DoItalicsAndBold = OPTIONS.asteriskIntraWordEmphasis ? _DoItalicsAndBold_AllowIntrawordWithAsterisk : _DoItalicsAndBoldStrict;
+
+        this.makeHtml = function (text) {
+
+            //
+            // Main function. The order in which other subs are called here is
+            // essential. Link and image substitutions need to happen before
+            // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
+            // and <img> tags get encoded.
+            //
+
+            // This will only happen if makeHtml on the same converter instance is called from a plugin hook.
+            // Don't do that.
+            if (g_urls)
+                throw new Error("Recursive call to converter.makeHtml");
+        
+            // Create the private state objects.
+            g_urls = new SaveHash();
+            g_titles = new SaveHash();
+            g_html_blocks = [];
+            g_list_level = 0;
+
+            text = pluginHooks.preConversion(text);
+
+            // attacklab: Replace ~ with ~T
+            // This lets us use tilde as an escape char to avoid md5 hashes
+            // The choice of character is arbitray; anything that isn't
+            // magic in Markdown will work.
+            text = text.replace(/~/g, "~T");
+
+            // attacklab: Replace $ with ~D
+            // RegExp interprets $ as a special character
+            // when it's in a replacement string
+            text = text.replace(/\$/g, "~D");
+
+            // Standardize line endings
+            text = text.replace(/\r\n/g, "\n"); // DOS to Unix
+            text = text.replace(/\r/g, "\n"); // Mac to Unix
+
+            // Make sure text begins and ends with a couple of newlines:
+            text = "\n\n" + text + "\n\n";
+
+            // Convert all tabs to spaces.
+            text = _Detab(text);
+
+            // Strip any lines consisting only of spaces and tabs.
+            // This makes subsequent regexen easier to write, because we can
+            // match consecutive blank lines with /\n+/ instead of something
+            // contorted like /[ \t]*\n+/ .
+            text = text.replace(/^[ \t]+$/mg, "");
+            
+            text = pluginHooks.postNormalization(text);
+
+            // Turn block-level HTML blocks into hash entries
+            text = _HashHTMLBlocks(text);
+
+            // Strip link definitions, store in hashes.
+            text = _StripLinkDefinitions(text);
+
+            text = _RunBlockGamut(text);
+
+            text = _UnescapeSpecialChars(text);
+
+            // attacklab: Restore dollar signs
+            text = text.replace(/~D/g, "$$");
+
+            // attacklab: Restore tildes
+            text = text.replace(/~T/g, "~");
+
+            text = pluginHooks.postConversion(text);
+
+            g_html_blocks = g_titles = g_urls = null;
+
+            return text;
+        };
+
+        function _StripLinkDefinitions(text) {
+            //
+            // Strips link definitions from text, stores the URLs and titles in
+            // hash references.
+            //
+
+            // Link defs are in the form: ^[id]: url "optional title"
+
+            /*
+            text = text.replace(/
+                ^[ ]{0,3}\[([^\[\]]+)\]:  // id = $1  attacklab: g_tab_width - 1
+                [ \t]*
+                \n?                 // maybe *one* newline
+                [ \t]*
+                <?(\S+?)>?          // url = $2
+                (?=\s|$)            // lookahead for whitespace instead of the lookbehind removed below
+                [ \t]*
+                \n?                 // maybe one newline
+                [ \t]*
+                (                   // (potential) title = $3
+                    (\n*)           // any lines skipped = $4 attacklab: lookbehind removed
+                    [ \t]+
+                    ["(]
+                    (.+?)           // title = $5
+                    [")]
+                    [ \t]*
+                )?                  // title is optional
+                (?:\n+|$)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/^[ ]{0,3}\[([^\[\]]+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?(?=\s|$)[ \t]*\n?[ \t]*((\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm,
+                function (wholeMatch, m1, m2, m3, m4, m5) {
+                    m1 = m1.toLowerCase();
+                    g_urls.set(m1, _EncodeAmpsAndAngles(m2));  // Link IDs are case-insensitive
+                    if (m4) {
+                        // Oops, found blank lines, so it's not a title.
+                        // Put back the parenthetical statement we stole.
+                        return m3;
+                    } else if (m5) {
+                        g_titles.set(m1, m5.replace(/"/g, "&quot;"));
+                    }
+
+                    // Completely remove the definition from the text
+                    return "";
+                }
+            );
+
+            return text;
+        }
+
+        function _HashHTMLBlocks(text) {
+
+            // Hashify HTML blocks:
+            // We only want to do this for block-level HTML tags, such as headers,
+            // lists, and tables. That's because we still want to wrap <p>s around
+            // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+            // phrase emphasis, and spans. The list of tags we're looking for is
+            // hard-coded:
+            var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
+            var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
+
+            // First, look for nested blocks, e.g.:
+            //   <div>
+            //     <div>
+            //     tags for inner block must be indented.
+            //     </div>
+            //   </div>
+            //
+            // The outermost tags must start at the left margin for this to match, and
+            // the inner nested divs must be indented.
+            // We need to do this before the next, more liberal match, because the next
+            // match will start at the first `<div>` and stop at the first `</div>`.
+
+            // attacklab: This regex can be expensive when it fails.
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_a)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?\n           // any number of lines, minimally matching
+                    </\2>               // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm, hashMatch);
+
+            //
+            // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
+            //
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_b)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?             // any number of lines, minimally matching
+                    .*</\2>             // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm, hashMatch);
+
+            // Special case just for <hr />. It was easier to make a special case than
+            // to make the other regex more complicated.  
+
+            /*
+            text = text.replace(/
+                \n                  // Starting after a blank line
+                [ ]{0,3}
+                (                   // save in $1
+                    (<(hr)          // start tag = $2
+                        \b          // word break
+                        ([^<>])*?
+                    \/?>)           // the matching end tag
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashMatch);
+            */
+            text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, hashMatch);
+
+            // Special case for standalone HTML comments:
+
+            /*
+            text = text.replace(/
+                \n\n                                            // Starting after a blank line
+                [ ]{0,3}                                        // attacklab: g_tab_width - 1
+                (                                               // save in $1
+                    <!
+                    (--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)   // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackexchange.com/q/95256
+                    >
+                    [ \t]*
+                    (?=\n{2,})                                  // followed by a blank line
+                )
+            /g,hashMatch);
+            */
+            text = text.replace(/\n\n[ ]{0,3}(<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>[ \t]*(?=\n{2,}))/g, hashMatch);
+
+            // PHP and ASP-style processor instructions (<?...?> and <%...%>)
+
+            /*
+            text = text.replace(/
+                (?:
+                    \n\n            // Starting after a blank line
+                )
+                (                   // save in $1
+                    [ ]{0,3}        // attacklab: g_tab_width - 1
+                    (?:
+                        <([?%])     // $2
+                        [^\r]*?
+                        \2>
+                    )
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashMatch);
+            */
+            text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, hashMatch);
+
+            return text;
+        }
+
+        function hashBlock(text) {
+            text = text.replace(/(^\n+|\n+$)/g, "");
+            // Replace the element text with a marker ("~KxK" where x is its key)
+            return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n";
+        }
+
+        function hashMatch(wholeMatch, m1) {
+            return hashBlock(m1);
+        }
+        
+        var blockGamutHookCallback = function (t) { return _RunBlockGamut(t); }
+
+        function _RunBlockGamut(text, doNotUnhash) {
+            //
+            // These are all the transformations that form block-level
+            // tags like paragraphs, headers, and list items.
+            //
+            
+            text = pluginHooks.preBlockGamut(text, blockGamutHookCallback);
+            
+            text = _DoHeaders(text);
+
+            // Do Horizontal Rules:
+            var replacement = "<hr />\n";
+            text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement);
+
+            text = _DoLists(text);
+            text = _DoCodeBlocks(text);
+            text = _DoBlockQuotes(text);
+            
+            text = pluginHooks.postBlockGamut(text, blockGamutHookCallback);
+
+            // We already ran _HashHTMLBlocks() before, in Markdown(), but that
+            // was to escape raw HTML in the original Markdown source. This time,
+            // we're escaping the markup we've just created, so that we don't wrap
+            // <p> tags around block-level tags.
+            text = _HashHTMLBlocks(text);
+            text = _FormParagraphs(text, doNotUnhash);
+
+            return text;
+        }
+
+        function _RunSpanGamut(text) {
+            //
+            // These are all the transformations that occur *within* block-level
+            // tags like paragraphs, headers, and list items.
+            //
+
+            text = pluginHooks.preSpanGamut(text);
+            
+            text = _DoCodeSpans(text);
+            text = _EscapeSpecialCharsWithinTagAttributes(text);
+            text = _EncodeBackslashEscapes(text);
+
+            // Process anchor and image tags. Images must come first,
+            // because ![foo][f] looks like an anchor.
+            text = _DoImages(text);
+            text = _DoAnchors(text);
+
+            // Make links out of things like `<http://example.com/>`
+            // Must come after _DoAnchors(), because you can use < and >
+            // delimiters in inline links like [this](<url>).
+            text = _DoAutoLinks(text);
+            
+            text = text.replace(/~P/g, "://"); // put in place to prevent autolinking; reset now
+            
+            text = _EncodeAmpsAndAngles(text);
+            text = _DoItalicsAndBold(text);
+
+            // Do hard breaks:
+            text = text.replace(/  +\n/g, " <br>\n");
+            
+            text = pluginHooks.postSpanGamut(text);
+
+            return text;
+        }
+
+        function _EscapeSpecialCharsWithinTagAttributes(text) {
+            //
+            // Within tags -- meaning between < and > -- encode [\ ` * _] so they
+            // don't conflict with their use in Markdown for code, italics and strong.
+            //
+
+            // Build a regex to find HTML tags and comments.  See Friedl's 
+            // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
+
+            // SE: changed the comment part of the regex
+
+            var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>)/gi;
+
+            text = text.replace(regex, function (wholeMatch) {
+                var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`");
+                tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`*_/" : "\\`*_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackexchange.com/questions/95987
+                return tag;
+            });
+
+            return text;
+        }
+
+        function _DoAnchors(text) {
+            
+            if (text.indexOf("[") === -1)
+                return text;
+            
+            //
+            // Turn Markdown link shortcuts into XHTML <a> tags.
+            //
+            //
+            // First, handle reference-style links: [link text] [id]
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[]           // or anything else
+                        )*
+                    )
+                    \]
+
+                    [ ]?                    // one optional space
+                    (?:\n[ ]*)?             // one optional newline followed by spaces
+
+                    \[
+                    (.*?)                   // id = $3
+                    \]
+                )
+                ()()()()                    // pad remaining backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag);
+
+            //
+            // Next, inline-style links: [link text](url "optional title")
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[\]]         // or anything else
+                        )*
+                    )
+                    \]
+                    \(                      // literal paren
+                    [ \t]*
+                    ()                      // no id, so leave $3 empty
+                    <?(                     // href = $4
+                        (?:
+                            \([^)]*\)       // allow one level of (correctly nested) parens (think MSDN)
+                            |
+                            [^()\s]
+                        )*?
+                    )>?                
+                    [ \t]*
+                    (                       // $5
+                        (['"])              // quote char = $6
+                        (.*?)               // Title = $7
+                        \6                  // matching quote
+                        [ \t]*              // ignore any spaces/tabs between closing quote and )
+                    )?                      // title is optional
+                    \)
+                )
+            /g, writeAnchorTag);
+            */
+
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?((?:\([^)]*\)|[^()\s])*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeAnchorTag);
+
+            //
+            // Last, handle reference-style shortcuts: [link text]
+            // These must come last in case you've also got [link test][1]
+            // or [link test](/foo)
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    \[
+                    ([^\[\]]+)      // link text = $2; can't contain '[' or ']'
+                    \]
+                )
+                ()()()()()          // pad rest of backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
+
+            return text;
+        }
+
+        function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
+            if (m7 == undefined) m7 = "";
+            var whole_match = m1;
+            var link_text = m2.replace(/:\/\//g, "~P"); // to prevent auto-linking withing the link. will be converted back after the auto-linker runs
+            var link_id = m3.toLowerCase();
+            var url = m4;
+            var title = m7;
+
+            if (url == "") {
+                if (link_id == "") {
+                    // lower-case and turn embedded newlines into spaces
+                    link_id = link_text.toLowerCase().replace(/ ?\n/g, " ");
+                }
+                url = "#" + link_id;
+
+                if (g_urls.get(link_id) != undefined) {
+                    url = g_urls.get(link_id);
+                    if (g_titles.get(link_id) != undefined) {
+                        title = g_titles.get(link_id);
+                    }
+                }
+                else {
+                    if (whole_match.search(/\(\s*\)$/m) > -1) {
+                        // Special case for explicit empty url
+                        url = "";
+                    } else {
+                        return whole_match;
+                    }
+                }
+            }
+            url = attributeSafeUrl(url);
+
+            var result = "<a href=\"" + url + "\"";
+
+            if (title != "") {
+                title = attributeEncode(title);
+                title = escapeCharacters(title, "*_");
+                result += " title=\"" + title + "\"";
+            }
+
+            result += ">" + link_text + "</a>";
+
+            return result;
+        }
+
+        function _DoImages(text) {
+            
+            if (text.indexOf("![") === -1)
+                return text;
+            
+            //
+            // Turn Markdown image shortcuts into <img> tags.
+            //
+
+            //
+            // First, handle reference-style labeled images: ![alt text][id]
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+
+                    [ ]?            // one optional space
+                    (?:\n[ ]*)?     // one optional newline followed by spaces
+
+                    \[
+                    (.*?)           // id = $3
+                    \]
+                )
+                ()()()()            // pad rest of backreferences
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeImageTag);
+
+            //
+            // Next, handle inline images:  ![alt text](url "optional title")
+            // Don't forget: encode * and _
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+                    \s?             // One optional whitespace character
+                    \(              // literal paren
+                    [ \t]*
+                    ()              // no id, so leave $3 empty
+                    <?(\S+?)>?      // src url = $4
+                    [ \t]*
+                    (               // $5
+                        (['"])      // quote char = $6
+                        (.*?)       // title = $7
+                        \6          // matching quote
+                        [ \t]*
+                    )?              // title is optional
+                    \)
+                )
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeImageTag);
+
+            return text;
+        }
+        
+        function attributeEncode(text) {
+            // unconditionally replace angle brackets here -- what ends up in an attribute (e.g. alt or title)
+            // never makes sense to have verbatim HTML in it (and the sanitizer would totally break it)
+            return text.replace(/>/g, "&gt;").replace(/</g, "&lt;").replace(/"/g, "&quot;").replace(/'/g, "&#39;");
+        }
+
+        function writeImageTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
+            var whole_match = m1;
+            var alt_text = m2;
+            var link_id = m3.toLowerCase();
+            var url = m4;
+            var title = m7;
+
+            if (!title) title = "";
+
+            if (url == "") {
+                if (link_id == "") {
+                    // lower-case and turn embedded newlines into spaces
+                    link_id = alt_text.toLowerCase().replace(/ ?\n/g, " ");
+                }
+                url = "#" + link_id;
+
+                if (g_urls.get(link_id) != undefined) {
+                    url = g_urls.get(link_id);
+                    if (g_titles.get(link_id) != undefined) {
+                        title = g_titles.get(link_id);
+                    }
+                }
+                else {
+                    return whole_match;
+                }
+            }
+            
+            alt_text = escapeCharacters(attributeEncode(alt_text), "*_[]()");
+            url = escapeCharacters(url, "*_");
+            var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
+
+            // attacklab: Markdown.pl adds empty title attributes to images.
+            // Replicate this bug.
+
+            //if (title != "") {
+            title = attributeEncode(title);
+            title = escapeCharacters(title, "*_");
+            result += " title=\"" + title + "\"";
+            //}
+
+            result += " />";
+
+            return result;
+        }
+
+        function _DoHeaders(text) {
+
+            // Setext-style headers:
+            //  Header 1
+            //  ========
+            //  
+            //  Header 2
+            //  --------
+            //
+            text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
+                function (wholeMatch, m1) { return "<h1>" + _RunSpanGamut(m1) + "</h1>\n\n"; }
+            );
+
+            text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
+                function (matchFound, m1) { return "<h2>" + _RunSpanGamut(m1) + "</h2>\n\n"; }
+            );
+
+            // atx-style headers:
+            //  # Header 1
+            //  ## Header 2
+            //  ## Header 2 with closing hashes ##
+            //  ...
+            //  ###### Header 6
+            //
+
+            /*
+            text = text.replace(/
+                ^(\#{1,6})      // $1 = string of #'s
+                [ \t]*
+                (.+?)           // $2 = Header text
+                [ \t]*
+                \#*             // optional closing #'s (not counted)
+                \n+
+            /gm, function() {...});
+            */
+
+            text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
+                function (wholeMatch, m1, m2) {
+                    var h_level = m1.length;
+                    return "<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">\n\n";
+                }
+            );
+
+            return text;
+        }
+
+        function _DoLists(text, isInsideParagraphlessListItem) {
+            //
+            // Form HTML ordered (numbered) and unordered (bulleted) lists.
+            //
+
+            // attacklab: add sentinel to hack around khtml/safari bug:
+            // http://bugs.webkit.org/show_bug.cgi?id=11231
+            text += "~0";
+
+            // Re-usable pattern to match any entirel ul or ol list:
+
+            /*
+            var whole_list = /
+                (                                   // $1 = whole list
+                    (                               // $2
+                        [ ]{0,3}                    // attacklab: g_tab_width - 1
+                        ([*+-]|\d+[.])              // $3 = first list item marker
+                        [ \t]+
+                    )
+                    [^\r]+?
+                    (                               // $4
+                        ~0                          // sentinel for workaround; should be $
+                        |
+                        \n{2,}
+                        (?=\S)
+                        (?!                         // Negative lookahead for another list item marker
+                            [ \t]*
+                            (?:[*+-]|\d+[.])[ \t]+
+                        )
+                    )
+                )
+            /g
+            */
+            var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
+            if (g_list_level) {
+                text = text.replace(whole_list, function (wholeMatch, m1, m2) {
+                    var list = m1;
+                    var list_type = (m2.search(/[*+-]/g) > -1) ? "ul" : "ol";
+                    var first_number;
+                    if (list_type === "ol")
+                        first_number = parseInt(m2, 10)
+
+                    var result = _ProcessListItems(list, list_type, isInsideParagraphlessListItem);
+
+                    // Trim any trailing whitespace, to put the closing `</$list_type>`
+                    // up on the preceding line, to get it past the current stupid
+                    // HTML block parser. This is a hack to work around the terrible
+                    // hack that is the HTML block parser.
+                    result = result.replace(/\s+$/, "");
+                    var opening = "<" + list_type;
+                    if (first_number && first_number !== 1)
+                        opening += " start=\"" + first_number + "\"";
+                    result = opening + ">" + result + "</" + list_type + ">\n";
+                    return result;
+                });
+            } else {
+                whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
+                text = text.replace(whole_list, function (wholeMatch, m1, m2, m3) {
+                    var runup = m1;
+                    var list = m2;
+
+                    var list_type = (m3.search(/[*+-]/g) > -1) ? "ul" : "ol";
+
+                    var first_number;
+                    if (list_type === "ol")
+                        first_number = parseInt(m3, 10)
+
+                    var result = _ProcessListItems(list, list_type);
+                    var opening = "<" + list_type;
+                    if (first_number && first_number !== 1)
+                        opening += " start=\"" + first_number + "\"";
+
+                    result = runup + opening + ">\n" + result + "</" + list_type + ">\n";
+                    return result;
+                });
+            }
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" };
+
+        function _ProcessListItems(list_str, list_type, isInsideParagraphlessListItem) {
+            //
+            //  Process the contents of a single ordered or unordered list, splitting it
+            //  into individual list items.
+            //
+            //  list_type is either "ul" or "ol".
+
+            // The $g_list_level global keeps track of when we're inside a list.
+            // Each time we enter a list, we increment it; when we leave a list,
+            // we decrement. If it's zero, we're not in a list anymore.
+            //
+            // We do this because when we're not inside a list, we want to treat
+            // something like this:
+            //
+            //    I recommend upgrading to version
+            //    8. Oops, now this line is treated
+            //    as a sub-list.
+            //
+            // As a single paragraph, despite the fact that the second line starts
+            // with a digit-period-space sequence.
+            //
+            // Whereas when we're inside a list (or sub-list), that line will be
+            // treated as the start of a sub-list. What a kludge, huh? This is
+            // an aspect of Markdown's syntax that's hard to parse perfectly
+            // without resorting to mind-reading. Perhaps the solution is to
+            // change the syntax rules such that sub-lists must start with a
+            // starting cardinal number; e.g. "1." or "a.".
+
+            g_list_level++;
+
+            // trim trailing blank lines:
+            list_str = list_str.replace(/\n{2,}$/, "\n");
+
+            // attacklab: add sentinel to emulate \z
+            list_str += "~0";
+
+            // In the original attacklab showdown, list_type was not given to this function, and anything
+            // that matched /[*+-]|\d+[.]/ would just create the next <li>, causing this mismatch:
+            //
+            //  Markdown          rendered by WMD        rendered by MarkdownSharp
+            //  ------------------------------------------------------------------
+            //  1. first          1. first               1. first
+            //  2. second         2. second              2. second
+            //  - third           3. third                   * third
+            //
+            // We changed this to behave identical to MarkdownSharp. This is the constructed RegEx,
+            // with {MARKER} being one of \d+[.] or [*+-], depending on list_type:
+        
+            /*
+            list_str = list_str.replace(/
+                (^[ \t]*)                       // leading whitespace = $1
+                ({MARKER}) [ \t]+               // list marker = $2
+                ([^\r]+?                        // list item text   = $3
+                    (\n+)
+                )
+                (?=
+                    (~0 | \2 ({MARKER}) [ \t]+)
+                )
+            /gm, function(){...});
+            */
+
+            var marker = _listItemMarkers[list_type];
+            var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0|\\1(" + marker + ")[ \\t]+))", "gm");
+            var last_item_had_a_double_newline = false;
+            list_str = list_str.replace(re,
+                function (wholeMatch, m1, m2, m3) {
+                    var item = m3;
+                    var leading_space = m1;
+                    var ends_with_double_newline = /\n\n$/.test(item);
+                    var contains_double_newline = ends_with_double_newline || item.search(/\n{2,}/) > -1;
+
+                    if (contains_double_newline || last_item_had_a_double_newline) {
+                        item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = */true);
+                    }
+                    else {
+                        // Recursion for sub-lists:
+                        item = _DoLists(_Outdent(item), /* isInsideParagraphlessListItem= */ true);
+                        item = item.replace(/\n$/, ""); // chomp(item)
+                        if (!isInsideParagraphlessListItem) // only the outer-most item should run this, otherwise it's run multiple times for the inner ones
+                            item = _RunSpanGamut(item);
+                    }
+                    last_item_had_a_double_newline = ends_with_double_newline;
+                    return "<li>" + item + "</li>\n";
+                }
+            );
+
+            // attacklab: strip sentinel
+            list_str = list_str.replace(/~0/g, "");
+
+            g_list_level--;
+            return list_str;
+        }
+
+        function _DoCodeBlocks(text) {
+            //
+            //  Process Markdown `<pre><code>` blocks.
+            //  
+
+            /*
+            text = text.replace(/
+                (?:\n\n|^)
+                (                               // $1 = the code block -- one or more lines, starting with a space/tab
+                    (?:
+                        (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
+                        .*\n+
+                    )+
+                )
+                (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
+            /g ,function(){...});
+            */
+
+            // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
+            text += "~0";
+
+            text = text.replace(/(?:\n\n|^\n?)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
+                function (wholeMatch, m1, m2) {
+                    var codeblock = m1;
+                    var nextChar = m2;
+
+                    codeblock = _EncodeCode(_Outdent(codeblock));
+                    codeblock = _Detab(codeblock);
+                    codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines
+                    codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace
+
+                    codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
+
+                    return "\n\n" + codeblock + "\n\n" + nextChar;
+                }
+            );
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        function _DoCodeSpans(text) {
+            //
+            // * Backtick quotes are used for <code></code> spans.
+            // 
+            // * You can use multiple backticks as the delimiters if you want to
+            //   include literal backticks in the code span. So, this input:
+            //     
+            //      Just type ``foo `bar` baz`` at the prompt.
+            //     
+            //   Will translate to:
+            //     
+            //      <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
+            //     
+            //   There's no arbitrary limit to the number of backticks you
+            //   can use as delimters. If you need three consecutive backticks
+            //   in your code, use four for delimiters, etc.
+            //
+            // * You can use spaces to get literal backticks at the edges:
+            //     
+            //      ... type `` `bar` `` ...
+            //     
+            //   Turns to:
+            //     
+            //      ... type <code>`bar`</code> ...
+            //
+
+            /*
+            text = text.replace(/
+                (^|[^\\`])      // Character before opening ` can't be a backslash or backtick
+                (`+)            // $2 = Opening run of `
+                (?!`)           // and no more backticks -- match the full run
+                (               // $3 = The code block
+                    [^\r]*?
+                    [^`]        // attacklab: work around lack of lookbehind
+                )
+                \2              // Matching closer
+                (?!`)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/(^|[^\\`])(`+)(?!`)([^\r]*?[^`])\2(?!`)/gm,
+                function (wholeMatch, m1, m2, m3, m4) {
+                    var c = m3;
+                    c = c.replace(/^([ \t]*)/g, ""); // leading whitespace
+                    c = c.replace(/[ \t]*$/g, ""); // trailing whitespace
+                    c = _EncodeCode(c);
+                    c = c.replace(/:\/\//g, "~P"); // to prevent auto-linking. Not necessary in code *blocks*, but in code spans. Will be converted back after the auto-linker runs.
+                    return m1 + "<code>" + c + "</code>";
+                }
+            );
+
+            return text;
+        }
+
+        function _EncodeCode(text) {
+            //
+            // Encode/escape certain characters inside Markdown code runs.
+            // The point is that in code, these characters are literals,
+            // and lose their special Markdown meanings.
+            //
+            // Encode all ampersands; HTML entities are not
+            // entities within a Markdown code span.
+            text = text.replace(/&/g, "&amp;");
+
+            // Do the angle bracket song and dance:
+            text = text.replace(/</g, "&lt;");
+            text = text.replace(/>/g, "&gt;");
+
+            // Now, escape characters that are magic in Markdown:
+            text = escapeCharacters(text, "\*_{}[]\\", false);
+
+            // jj the line above breaks this:
+            //---
+
+            //* Item
+
+            //   1. Subitem
+
+            //            special char: *
+            //---
+
+            return text;
+        }
+
+        function _DoItalicsAndBoldStrict(text) {
+
+            if (text.indexOf("*") === -1 && text.indexOf("_") === - 1)
+                return text;
+            
+            text = asciify(text);
+        
+            // <strong> must go first:
+            
+            // (^|[\W_])           Start with a non-letter or beginning of string. Store in \1.
+            // (?:(?!\1)|(?=^))    Either the next character is *not* the same as the previous,
+            //                     or we started at the end of the string (in which case the previous
+            //                     group had zero width, so we're still there). Because the next
+            //                     character is the marker, this means that if there are e.g. multiple
+            //                     underscores in a row, we can only match the left-most ones (which
+            //                     prevents foo___bar__ from getting bolded)
+            // (\*|_)              The marker character itself, asterisk or underscore. Store in \2.
+            // \2                  The marker again, since bold needs two.
+            // (?=\S)              The first bolded character cannot be a space.
+            // ([^\r]*?\S)         The actual bolded string. At least one character, and it cannot *end*
+            //                     with a space either. Note that like in many other places, [^\r] is
+            //                     just a workaround for JS' lack of single-line regexes; it's equivalent
+            //                     to a . in an /s regex, because the string cannot contain any \r (they
+            //                     are removed in the normalizing step).
+            // \2\2                The marker character, twice -- end of bold.
+            // (?!\2)              Not followed by another marker character (ensuring that we match the
+            //                     rightmost two in a longer row)...
+            // (?=[\W_]|$)         ...but by any other non-word character or the end of string.
+            text = text.replace(/(^|[\W_])(?:(?!\1)|(?=^))(\*|_)\2(?=\S)([^\r]*?\S)\2\2(?!\2)(?=[\W_]|$)/g,
+            "$1<strong>$3</strong>");
+
+            // This is almost identical to the <strong> regex, except 1) there's obviously just one marker
+            // character, and 2) the italicized string cannot contain the marker character.
+            text = text.replace(/(^|[\W_])(?:(?!\1)|(?=^))(\*|_)(?=\S)((?:(?!\2)[^\r])*?\S)\2(?!\2)(?=[\W_]|$)/g,
+            "$1<em>$3</em>");
+
+            return deasciify(text);
+        }
+
+        function _DoItalicsAndBold_AllowIntrawordWithAsterisk(text) {
+            
+            if (text.indexOf("*") === -1 && text.indexOf("_") === - 1)
+                return text;
+            
+            text = asciify(text);
+        
+            // <strong> must go first:
+            // (?=[^\r][*_]|[*_])               Optimization only, to find potentially relevant text portions faster. Minimally slower in Chrome, but much faster in IE.
+            // (                                Store in \1. This is the last character before the delimiter
+            //     ^                            Either we're at the start of the string (i.e. there is no last character)...
+            //     |                            ... or we allow one of the following:
+            //     (?=                          (lookahead; we're not capturing this, just listing legal possibilities)
+            //         \W__                     If the delimiter is __, then this last character must be non-word non-underscore (extra-word emphasis only)
+            //         |
+            //         (?!\*)[\W_]\*\*          If the delimiter is **, then this last character can be non-word non-asterisk (extra-word emphasis)...
+            //         |
+            //         \w\*\*\w                 ...or it can be word/underscore, but only if the first bolded character is such a character as well (intra-word emphasis)
+            //     )
+            //     [^\r]                        actually capture the character (can't use `.` since it could be \n)
+            // )
+            // (\*\*|__)                        Store in \2: the actual delimiter
+            // (?!\2)                           not followed by the delimiter again (at most one more asterisk/underscore is allowed)
+            // (?=\S)                           the first bolded character can't be a space
+            // (                                Store in \3: the bolded string
+            //                                  
+            //     (?:|                         Look at all bolded characters except for the last one. Either that's empty, meaning only a single character was bolded...
+            //       [^\r]*?                    ... otherwise take arbitrary characters, minimally matching; that's all bolded characters except for the last *two*
+            //       (?!\2)                       the last two characters cannot be the delimiter itself (because that would mean four underscores/asterisks in a row)
+            //       [^\r]                        capture the next-to-last bolded character
+            //     )
+            //     (?=                          lookahead at the very last bolded char and what comes after
+            //         \S_                      for underscore-bolding, it can be any non-space
+            //         |
+            //         \w                       for asterisk-bolding (otherwise the previous alternative would've matched, since \w implies \S), either the last char is word/underscore...
+            //         |
+            //         \S\*\*(?:[\W_]|$)        ... or it's any other non-space, but in that case the character *after* the delimiter may not be a word character
+            //     )
+            //     .                            actually capture the last character (can use `.` this time because the lookahead ensures \S in all cases)
+            // )
+            // (?=                              lookahead; list the legal possibilities for the closing delimiter and its following character
+            //     __(?:\W|$)                   for underscore-bolding, the following character (if any) must be non-word non-underscore
+            //     |
+            //     \*\*(?:[^*]|$)               for asterisk-bolding, any non-asterisk is allowed (note we already ensured above that it's not a word character if the last bolded character wasn't one)
+            // )
+            // \2                               actually capture the closing delimiter (and make sure that it matches the opening one)
+          
+            text = text.replace(/(?=[^\r][*_]|[*_])(^|(?=\W__|(?!\*)[\W_]\*\*|\w\*\*\w)[^\r])(\*\*|__)(?!\2)(?=\S)((?:|[^\r]*?(?!\2)[^\r])(?=\S_|\w|\S\*\*(?:[\W_]|$)).)(?=__(?:\W|$)|\*\*(?:[^*]|$))\2/g,
+            "$1<strong>$3</strong>");
+
+            // now <em>:
+            // (?=[^\r][*_]|[*_])               Optimization, see above.
+            // (                                Store in \1. This is the last character before the delimiter
+            //     ^                            Either we're at the start of the string (i.e. there is no last character)...
+            //     |                            ... or we allow one of the following:
+            //     (?=                          (lookahead; we're not capturing this, just listing legal possibilities)
+            //         \W_                      If the delimiter is _, then this last character must be non-word non-underscore (extra-word emphasis only)
+            //         |
+            //         (?!\*)                   otherwise, we list two possiblities for * as the delimiter; in either case, the last characters cannot be an asterisk itself
+            //         (?:
+            //             [\W_]\*              this last character can be non-word (extra-word emphasis)...
+            //             |
+            //             \D\*(?=\w)\D         ...or it can be word (otherwise the first alternative would've matched), but only if
+            //                                      a) the first italicized character is such a character as well (intra-word emphasis), and
+            //                                      b) neither character on either side of the asterisk is a digit            
+            //         )
+            //     )
+            //     [^\r]                        actually capture the character (can't use `.` since it could be \n)
+            // )
+            // (\*|_)                           Store in \2: the actual delimiter
+            // (?!\2\2\2)                       not followed by more than two more instances of the delimiter
+            // (?=\S)                           the first italicized character can't be a space
+            // (                                Store in \3: the italicized string
+            //     (?:(?!\2)[^\r])*?            arbitrary characters except for the delimiter itself, minimally matching
+            //     (?=                          lookahead at the very last italicized char and what comes after
+            //         [^\s_]_                  for underscore-italicizing, it can be any non-space non-underscore
+            //         |
+            //         (?=\w)\D\*\D             for asterisk-italicizing, either the last char is word/underscore *and* neither character on either side of the asterisk is a digit...
+            //         |
+            //         [^\s*]\*(?:[\W_]|$)      ... or that last char is any other non-space non-asterisk, but then the character after the delimiter (if any) must be non-word
+            //     )
+            //     .                            actually capture the last character (can use `.` this time because the lookahead ensures \S in all cases)
+            // )
+            // (?=                              lookahead; list the legal possibilities for the closing delimiter and its following character
+            //     _(?:\W|$)                    for underscore-italicizing, the following character (if any) must be non-word non-underscore
+            //     |
+            //     \*(?:[^*]|$)                 for asterisk-italicizing, any non-asterisk is allowed; all other restrictions have already been ensured in the previous lookahead
+            // )
+            // \2                               actually capture the closing delimiter (and make sure that it matches the opening one)
+
+            text = text.replace(/(?=[^\r][*_]|[*_])(^|(?=\W_|(?!\*)(?:[\W_]\*|\D\*(?=\w)\D))[^\r])(\*|_)(?!\2\2\2)(?=\S)((?:(?!\2)[^\r])*?(?=[^\s_]_|(?=\w)\D\*\D|[^\s*]\*(?:[\W_]|$)).)(?=_(?:\W|$)|\*(?:[^*]|$))\2/g,
+            "$1<em>$3</em>");
+            
+            return deasciify(text);
+        }        
+
+        
+        function _DoBlockQuotes(text) {
+
+            /*
+            text = text.replace(/
+                (                           // Wrap whole match in $1
+                    (
+                        ^[ \t]*>[ \t]?      // '>' at the start of a line
+                        .+\n                // rest of the first line
+                        (.+\n)*             // subsequent consecutive lines
+                        \n*                 // blanks
+                    )+
+                )
+            /gm, function(){...});
+            */
+
+            text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
+                function (wholeMatch, m1) {
+                    var bq = m1;
+
+                    // attacklab: hack around Konqueror 3.5.4 bug:
+                    // "----------bug".replace(/^-/g,"") == "bug"
+
+                    bq = bq.replace(/^[ \t]*>[ \t]?/gm, "~0"); // trim one level of quoting
+
+                    // attacklab: clean up hack
+                    bq = bq.replace(/~0/g, "");
+
+                    bq = bq.replace(/^[ \t]+$/gm, "");     // trim whitespace-only lines
+                    bq = _RunBlockGamut(bq);             // recurse
+
+                    bq = bq.replace(/(^|\n)/g, "$1  ");
+                    // These leading spaces screw with <pre> content, so we need to fix that:
+                    bq = bq.replace(
+                            /(\s*<pre>[^\r]+?<\/pre>)/gm,
+                        function (wholeMatch, m1) {
+                            var pre = m1;
+                            // attacklab: hack around Konqueror 3.5.4 bug:
+                            pre = pre.replace(/^  /mg, "~0");
+                            pre = pre.replace(/~0/g, "");
+                            return pre;
+                        });
+
+                    return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
+                }
+            );
+            return text;
+        }
+
+        function _FormParagraphs(text, doNotUnhash) {
+            //
+            //  Params:
+            //    $text - string to process with html <p> tags
+            //
+
+            // Strip leading and trailing lines:
+            text = text.replace(/^\n+/g, "");
+            text = text.replace(/\n+$/g, "");
+
+            var grafs = text.split(/\n{2,}/g);
+            var grafsOut = [];
+            
+            var markerRe = /~K(\d+)K/;
+
+            //
+            // Wrap <p> tags.
+            //
+            var end = grafs.length;
+            for (var i = 0; i < end; i++) {
+                var str = grafs[i];
+
+                // if this is an HTML marker, copy it
+                if (markerRe.test(str)) {
+                    grafsOut.push(str);
+                }
+                else if (/\S/.test(str)) {
+                    str = _RunSpanGamut(str);
+                    str = str.replace(/^([ \t]*)/g, "<p>");
+                    str += "</p>"
+                    grafsOut.push(str);
+                }
+
+            }
+            //
+            // Unhashify HTML blocks
+            //
+            if (!doNotUnhash) {
+                end = grafsOut.length;
+                for (var i = 0; i < end; i++) {
+                    var foundAny = true;
+                    while (foundAny) { // we may need several runs, since the data may be nested
+                        foundAny = false;
+                        grafsOut[i] = grafsOut[i].replace(/~K(\d+)K/g, function (wholeMatch, id) {
+                            foundAny = true;
+                            return g_html_blocks[id];
+                        });
+                    }
+                }
+            }
+            return grafsOut.join("\n\n");
+        }
+
+        function _EncodeAmpsAndAngles(text) {
+            // Smart processing for ampersands and angle brackets that need to be encoded.
+
+            // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
+            //   http://bumppo.net/projects/amputator/
+            text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, "&amp;");
+
+            // Encode naked <'s
+            text = text.replace(/<(?![a-z\/?!]|~D)/gi, "&lt;");
+
+            return text;
+        }
+
+        function _EncodeBackslashEscapes(text) {
+            //
+            //   Parameter:  String.
+            //   Returns:    The string, with after processing the following backslash
+            //               escape sequences.
+            //
+
+            // attacklab: The polite way to do this is with the new
+            // escapeCharacters() function:
+            //
+            //     text = escapeCharacters(text,"\\",true);
+            //     text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
+            //
+            // ...but we're sidestepping its use of the (slow) RegExp constructor
+            // as an optimization for Firefox.  This function gets called a LOT.
+
+            text = text.replace(/\\(\\)/g, escapeCharacters_callback);
+            text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g, escapeCharacters_callback);
+            return text;
+        }
+
+        var charInsideUrl = "[-A-Z0-9+&@#/%?=~_|[\\]()!:,.;]",
+            charEndingUrl = "[-A-Z0-9+&@#/%=~_|[\\])]",
+            autoLinkRegex = new RegExp("(=\"|<)?\\b(https?|ftp)(://" + charInsideUrl + "*" + charEndingUrl + ")(?=$|\\W)", "gi"),
+            endCharRegex = new RegExp(charEndingUrl, "i");
+
+        function handleTrailingParens(wholeMatch, lookbehind, protocol, link) {
+            if (lookbehind)
+                return wholeMatch;
+            if (link.charAt(link.length - 1) !== ")")
+                return "<" + protocol + link + ">";
+            var parens = link.match(/[()]/g);
+            var level = 0;
+            for (var i = 0; i < parens.length; i++) {
+                if (parens[i] === "(") {
+                    if (level <= 0)
+                        level = 1;
+                    else
+                        level++;
+                }
+                else {
+                    level--;
+                }
+            }
+            var tail = "";
+            if (level < 0) {
+                var re = new RegExp("\\){1," + (-level) + "}$");
+                link = link.replace(re, function (trailingParens) {
+                    tail = trailingParens;
+                    return "";
+                });
+            }
+            if (tail) {
+                var lastChar = link.charAt(link.length - 1);
+                if (!endCharRegex.test(lastChar)) {
+                    tail = lastChar + tail;
+                    link = link.substr(0, link.length - 1);
+                }
+            }
+            return "<" + protocol + link + ">" + tail;
+        }
+        
+        function _DoAutoLinks(text) {
+
+            // note that at this point, all other URL in the text are already hyperlinked as <a href=""></a>
+            // *except* for the <http://www.foo.com> case
+
+            // automatically add < and > around unadorned raw hyperlinks
+            // must be preceded by a non-word character (and not by =" or <) and followed by non-word/EOF character
+            // simulating the lookbehind in a consuming way is okay here, since a URL can neither and with a " nor
+            // with a <, so there is no risk of overlapping matches.
+            text = text.replace(autoLinkRegex, handleTrailingParens);
+
+            //  autolink anything like <http://example.com>
+            
+
+            var replacer = function (wholematch, m1) {
+                var url = attributeSafeUrl(m1);
+                
+                return "<a href=\"" + url + "\">" + pluginHooks.plainLinkText(m1) + "</a>";
+            };
+            text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
+
+            // Email addresses: <address@domain.foo>
+            /*
+            text = text.replace(/
+                <
+                (?:mailto:)?
+                (
+                    [-.\w]+
+                    \@
+                    [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
+                )
+                >
+            /gi, _DoAutoLinks_callback());
+            */
+
+            /* disabling email autolinking, since we don't do that on the server, either
+            text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
+                function(wholeMatch,m1) {
+                    return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
+                }
+            );
+            */
+            return text;
+        }
+
+        function _UnescapeSpecialChars(text) {
+            //
+            // Swap back in all the special characters we've hidden.
+            //
+            text = text.replace(/~E(\d+)E/g,
+                function (wholeMatch, m1) {
+                    var charCodeToReplace = parseInt(m1);
+                    return String.fromCharCode(charCodeToReplace);
+                }
+            );
+            return text;
+        }
+
+        function _Outdent(text) {
+            //
+            // Remove one level of line-leading tabs or spaces
+            //
+
+            // attacklab: hack around Konqueror 3.5.4 bug:
+            // "----------bug".replace(/^-/g,"") == "bug"
+
+            text = text.replace(/^(\t|[ ]{1,4})/gm, "~0"); // attacklab: g_tab_width
+
+            // attacklab: clean up hack
+            text = text.replace(/~0/g, "")
+
+            return text;
+        }
+
+        function _Detab(text) {
+            if (!/\t/.test(text))
+                return text;
+
+            var spaces = ["    ", "   ", "  ", " "],
+            skew = 0,
+            v;
+
+            return text.replace(/[\n\t]/g, function (match, offset) {
+                if (match === "\n") {
+                    skew = offset + 1;
+                    return match;
+                }
+                v = (offset - skew) % 4;
+                skew = offset + 1;
+                return spaces[v];
+            });
+        }
+
+        //
+        //  attacklab: Utility functions
+        //
+
+        function attributeSafeUrl(url) {
+            url = attributeEncode(url);
+            url = escapeCharacters(url, "*_:()[]")
+            return url;
+        }
+
+        function escapeCharacters(text, charsToEscape, afterBackslash) {
+            // First we have to escape the escape characters so that
+            // we can build a character class out of them
+            var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])";
+
+            if (afterBackslash) {
+                regexString = "\\\\" + regexString;
+            }
+
+            var regex = new RegExp(regexString, "g");
+            text = text.replace(regex, escapeCharacters_callback);
+
+            return text;
+        }
+
+
+        function escapeCharacters_callback(wholeMatch, m1) {
+            var charCodeToEscape = m1.charCodeAt(0);
+            return "~E" + charCodeToEscape + "E";
+        }
+
+    }; // end of the Markdown.Converter constructor
+
+})();
\ No newline at end of file
diff --git a/webgui/3rdparty/pagedown/Markdown.Editor.js b/webgui/3rdparty/pagedown/Markdown.Editor.js
new file mode 100644
index 000000000..e3205cc61
--- /dev/null
+++ b/webgui/3rdparty/pagedown/Markdown.Editor.js
@@ -0,0 +1,2243 @@
+// needs Markdown.Converter.js at the moment
+
+(function () {
+
+    var util = {},
+        position = {},
+        ui = {},
+        doc = window.document,
+        re = window.RegExp,
+        nav = window.navigator,
+        SETTINGS = { lineLength: 72 },
+
+    // Used to work around some browser bugs where we can't use feature testing.
+        uaSniffed = {
+            isIE: /msie/.test(nav.userAgent.toLowerCase()),
+            isIE_5or6: /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase()),
+            isOpera: /opera/.test(nav.userAgent.toLowerCase())
+        };
+
+    var defaultsStrings = {
+        bold: "Strong <strong> Ctrl+B",
+        boldexample: "strong text",
+
+        italic: "Emphasis <em> Ctrl+I",
+        italicexample: "emphasized text",
+
+        link: "Hyperlink <a> Ctrl+L",
+        linkdescription: "enter link description here",
+        linkdialog: "<p><b>Insert Hyperlink</b></p><p>http://example.com/ \"optional title\"</p>",
+
+        quote: "Blockquote <blockquote> Ctrl+Q",
+        quoteexample: "Blockquote",
+
+        code: "Code Sample <pre><code> Ctrl+K",
+        codeexample: "enter code here",
+
+        image: "Image <img> Ctrl+G",
+        imagedescription: "enter image description here",
+        imagedialog: "<p><b>Insert Image</b></p><p>http://example.com/images/diagram.jpg \"optional title\"<br><br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",
+
+        olist: "Numbered List <ol> Ctrl+O",
+        ulist: "Bulleted List <ul> Ctrl+U",
+        litem: "List item",
+
+        heading: "Heading <h1>/<h2> Ctrl+H",
+        headingexample: "Heading",
+
+        hr: "Horizontal Rule <hr> Ctrl+R",
+
+        undo: "Undo - Ctrl+Z",
+        redo: "Redo - Ctrl+Y",
+        redomac: "Redo - Ctrl+Shift+Z",
+
+        help: "Markdown Editing Help"
+    };
+
+
+    // -------------------------------------------------------------------
+    //  YOUR CHANGES GO HERE
+    //
+    // I've tried to localize the things you are likely to change to
+    // this area.
+    // -------------------------------------------------------------------
+
+    // The default text that appears in the dialog input box when entering
+    // links.
+    var imageDefaultText = "http://";
+    var linkDefaultText = "http://";
+
+    // -------------------------------------------------------------------
+    //  END OF YOUR CHANGES
+    // -------------------------------------------------------------------
+
+    // options, if given, can have the following properties:
+    //   options.helpButton = { handler: yourEventHandler }
+    //   options.strings = { italicexample: "slanted text" }
+    // `yourEventHandler` is the click handler for the help button.
+    // If `options.helpButton` isn't given, not help button is created.
+    // `options.strings` can have any or all of the same properties as
+    // `defaultStrings` above, so you can just override some string displayed
+    // to the user on a case-by-case basis, or translate all strings to
+    // a different language.
+    //
+    // For backwards compatibility reasons, the `options` argument can also
+    // be just the `helpButton` object, and `strings.help` can also be set via
+    // `helpButton.title`. This should be considered legacy.
+    //
+    // The constructed editor object has the methods:
+    // - getConverter() returns the markdown converter object that was passed to the constructor
+    // - run() actually starts the editor; should be called after all necessary plugins are registered. Calling this more than once is a no-op.
+    // - refreshPreview() forces the preview to be updated. This method is only available after run() was called.
+    Markdown.Editor = function (markdownConverter, idPostfix, options) {
+        
+        options = options || {};
+
+        if (typeof options.handler === "function") { //backwards compatible behavior
+            options = { helpButton: options };
+        }
+        options.strings = options.strings || {};
+        if (options.helpButton) {
+            options.strings.help = options.strings.help || options.helpButton.title;
+        }
+        var getString = function (identifier) { return options.strings[identifier] || defaultsStrings[identifier]; }
+
+        idPostfix = idPostfix || "";
+
+        var hooks = this.hooks = new Markdown.HookCollection();
+        hooks.addNoop("onPreviewRefresh");       // called with no arguments after the preview has been refreshed
+        hooks.addNoop("postBlockquoteCreation"); // called with the user's selection *after* the blockquote was created; should return the actual to-be-inserted text
+        hooks.addFalse("insertImageDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
+                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
+                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
+                                                  */
+
+        this.getConverter = function () { return markdownConverter; }
+
+        var that = this,
+            panels;
+
+        this.run = function () {
+            if (panels)
+                return; // already initialized
+
+            panels = new PanelCollection(idPostfix);
+            var commandManager = new CommandManager(hooks, getString);
+            var previewManager = new PreviewManager(markdownConverter, panels, function () { hooks.onPreviewRefresh(); });
+            var undoManager, uiManager;
+
+            if (!/\?noundo/.test(doc.location.href)) {
+                undoManager = new UndoManager(function () {
+                    previewManager.refresh();
+                    if (uiManager) // not available on the first call
+                        uiManager.setUndoRedoButtonStates();
+                }, panels);
+                this.textOperation = function (f) {
+                    undoManager.setCommandMode();
+                    f();
+                    that.refreshPreview();
+                }
+            }
+
+            uiManager = new UIManager(idPostfix, panels, undoManager, previewManager, commandManager, options.helpButton, getString);
+            uiManager.setUndoRedoButtonStates();
+
+            var forceRefresh = that.refreshPreview = function () { previewManager.refresh(true); };
+
+            forceRefresh();
+        };
+
+    }
+
+    // before: contains all the text in the input box BEFORE the selection.
+    // after: contains all the text in the input box AFTER the selection.
+    function Chunks() { }
+
+    // startRegex: a regular expression to find the start tag
+    // endRegex: a regular expresssion to find the end tag
+    Chunks.prototype.findTags = function (startRegex, endRegex) {
+
+        var chunkObj = this;
+        var regex;
+
+        if (startRegex) {
+
+            regex = util.extendRegExp(startRegex, "", "$");
+
+            this.before = this.before.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+
+            regex = util.extendRegExp(startRegex, "^", "");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+        }
+
+        if (endRegex) {
+
+            regex = util.extendRegExp(endRegex, "", "$");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+
+            regex = util.extendRegExp(endRegex, "^", "");
+
+            this.after = this.after.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+        }
+    };
+
+    // If remove is false, the whitespace is transferred
+    // to the before/after regions.
+    //
+    // If remove is true, the whitespace disappears.
+    Chunks.prototype.trimWhitespace = function (remove) {
+        var beforeReplacer, afterReplacer, that = this;
+        if (remove) {
+            beforeReplacer = afterReplacer = "";
+        } else {
+            beforeReplacer = function (s) { that.before += s; return ""; }
+            afterReplacer = function (s) { that.after = s + that.after; return ""; }
+        }
+
+        this.selection = this.selection.replace(/^(\s*)/, beforeReplacer).replace(/(\s*)$/, afterReplacer);
+    };
+
+
+    Chunks.prototype.skipLines = function (nLinesBefore, nLinesAfter, findExtraNewlines) {
+
+        if (nLinesBefore === undefined) {
+            nLinesBefore = 1;
+        }
+
+        if (nLinesAfter === undefined) {
+            nLinesAfter = 1;
+        }
+
+        nLinesBefore++;
+        nLinesAfter++;
+
+        var regexText;
+        var replacementText;
+
+        // chrome bug ... documented at: http://meta.stackexchange.com/questions/63307/blockquote-glitch-in-editor-in-chrome-6-and-7/65985#65985
+        if (navigator.userAgent.match(/Chrome/)) {
+            "X".match(/()./);
+        }
+
+        this.selection = this.selection.replace(/(^\n*)/, "");
+
+        this.startTag = this.startTag + re.$1;
+
+        this.selection = this.selection.replace(/(\n*$)/, "");
+        this.endTag = this.endTag + re.$1;
+        this.startTag = this.startTag.replace(/(^\n*)/, "");
+        this.before = this.before + re.$1;
+        this.endTag = this.endTag.replace(/(\n*$)/, "");
+        this.after = this.after + re.$1;
+
+        if (this.before) {
+
+            regexText = replacementText = "";
+
+            while (nLinesBefore--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+            this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
+        }
+
+        if (this.after) {
+
+            regexText = replacementText = "";
+
+            while (nLinesAfter--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+
+            this.after = this.after.replace(new re(regexText, ""), replacementText);
+        }
+    };
+
+    // end of Chunks
+
+    // A collection of the important regions on the page.
+    // Cached so we don't have to keep traversing the DOM.
+    // Also holds ieCachedRange and ieCachedScrollTop, where necessary; working around
+    // this issue:
+    // Internet explorer has problems with CSS sprite buttons that use HTML
+    // lists.  When you click on the background image "button", IE will
+    // select the non-existent link text and discard the selection in the
+    // textarea.  The solution to this is to cache the textarea selection
+    // on the button's mousedown event and set a flag.  In the part of the
+    // code where we need to grab the selection, we check for the flag
+    // and, if it's set, use the cached area instead of querying the
+    // textarea.
+    //
+    // This ONLY affects Internet Explorer (tested on versions 6, 7
+    // and 8) and ONLY on button clicks.  Keyboard shortcuts work
+    // normally since the focus never leaves the textarea.
+    function PanelCollection(postfix) {
+        this.buttonBar = doc.getElementById("wmd-button-bar" + postfix);
+        this.preview = doc.getElementById("wmd-preview" + postfix);
+        this.input = doc.getElementById("wmd-input" + postfix);
+    };
+
+    // Returns true if the DOM element is visible, false if it's hidden.
+    // Checks if display is anything other than none.
+    util.isVisible = function (elem) {
+
+        if (window.getComputedStyle) {
+            // Most browsers
+            return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
+        }
+        else if (elem.currentStyle) {
+            // IE
+            return elem.currentStyle["display"] !== "none";
+        }
+    };
+
+
+    // Adds a listener callback to a DOM element which is fired on a specified
+    // event.
+    util.addEvent = function (elem, event, listener) {
+        if (elem.attachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.attachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.addEventListener(event, listener, false);
+        }
+    };
+
+
+    // Removes a listener callback from a DOM element which is fired on a specified
+    // event.
+    util.removeEvent = function (elem, event, listener) {
+        if (elem.detachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.detachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.removeEventListener(event, listener, false);
+        }
+    };
+
+    // Converts \r\n and \r to \n.
+    util.fixEolChars = function (text) {
+        text = text.replace(/\r\n/g, "\n");
+        text = text.replace(/\r/g, "\n");
+        return text;
+    };
+
+    // Extends a regular expression.  Returns a new RegExp
+    // using pre + regex + post as the expression.
+    // Used in a few functions where we have a base
+    // expression and we want to pre- or append some
+    // conditions to it (e.g. adding "$" to the end).
+    // The flags are unchanged.
+    //
+    // regex is a RegExp, pre and post are strings.
+    util.extendRegExp = function (regex, pre, post) {
+
+        if (pre === null || pre === undefined) {
+            pre = "";
+        }
+        if (post === null || post === undefined) {
+            post = "";
+        }
+
+        var pattern = regex.toString();
+        var flags;
+
+        // Replace the flags with empty space and store them.
+        pattern = pattern.replace(/\/([gim]*)$/, function (wholeMatch, flagsPart) {
+            flags = flagsPart;
+            return "";
+        });
+
+        // Remove the slash delimiters on the regular expression.
+        pattern = pattern.replace(/(^\/|\/$)/g, "");
+        pattern = pre + pattern + post;
+
+        return new re(pattern, flags);
+    }
+
+    // UNFINISHED
+    // The assignment in the while loop makes jslint cranky.
+    // I'll change it to a better loop later.
+    position.getTop = function (elem, isInner) {
+        var result = elem.offsetTop;
+        if (!isInner) {
+            while (elem = elem.offsetParent) {
+                result += elem.offsetTop;
+            }
+        }
+        return result;
+    };
+
+    position.getHeight = function (elem) {
+        return elem.offsetHeight || elem.scrollHeight;
+    };
+
+    position.getWidth = function (elem) {
+        return elem.offsetWidth || elem.scrollWidth;
+    };
+
+    position.getPageSize = function () {
+
+        var scrollWidth, scrollHeight;
+        var innerWidth, innerHeight;
+
+        // It's not very clear which blocks work with which browsers.
+        if (self.innerHeight && self.scrollMaxY) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = self.innerHeight + self.scrollMaxY;
+        }
+        else if (doc.body.scrollHeight > doc.body.offsetHeight) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = doc.body.scrollHeight;
+        }
+        else {
+            scrollWidth = doc.body.offsetWidth;
+            scrollHeight = doc.body.offsetHeight;
+        }
+
+        if (self.innerHeight) {
+            // Non-IE browser
+            innerWidth = self.innerWidth;
+            innerHeight = self.innerHeight;
+        }
+        else if (doc.documentElement && doc.documentElement.clientHeight) {
+            // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
+            innerWidth = doc.documentElement.clientWidth;
+            innerHeight = doc.documentElement.clientHeight;
+        }
+        else if (doc.body) {
+            // Other versions of IE
+            innerWidth = doc.body.clientWidth;
+            innerHeight = doc.body.clientHeight;
+        }
+
+        var maxWidth = Math.max(scrollWidth, innerWidth);
+        var maxHeight = Math.max(scrollHeight, innerHeight);
+        return [maxWidth, maxHeight, innerWidth, innerHeight];
+    };
+
+    // Handles pushing and popping TextareaStates for undo/redo commands.
+    // I should rename the stack variables to list.
+    function UndoManager(callback, panels) {
+
+        var undoObj = this;
+        var undoStack = []; // A stack of undo states
+        var stackPtr = 0; // The index of the current state
+        var mode = "none";
+        var lastState; // The last state
+        var timer; // The setTimeout handle for cancelling the timer
+        var inputStateObj;
+
+        // Set the mode for later logic steps.
+        var setMode = function (newMode, noSave) {
+            if (mode != newMode) {
+                mode = newMode;
+                if (!noSave) {
+                    saveState();
+                }
+            }
+
+            if (!uaSniffed.isIE || mode != "moving") {
+                timer = setTimeout(refreshState, 1);
+            }
+            else {
+                inputStateObj = null;
+            }
+        };
+
+        var refreshState = function (isInitialState) {
+            inputStateObj = new TextareaState(panels, isInitialState);
+            timer = undefined;
+        };
+
+        this.setCommandMode = function () {
+            mode = "command";
+            saveState();
+            timer = setTimeout(refreshState, 0);
+        };
+
+        this.canUndo = function () {
+            return stackPtr > 1;
+        };
+
+        this.canRedo = function () {
+            if (undoStack[stackPtr + 1]) {
+                return true;
+            }
+            return false;
+        };
+
+        // Removes the last state and restores it.
+        this.undo = function () {
+
+            if (undoObj.canUndo()) {
+                if (lastState) {
+                    // What about setting state -1 to null or checking for undefined?
+                    lastState.restore();
+                    lastState = null;
+                }
+                else {
+                    undoStack[stackPtr] = new TextareaState(panels);
+                    undoStack[--stackPtr].restore();
+
+                    if (callback) {
+                        callback();
+                    }
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Redo an action.
+        this.redo = function () {
+
+            if (undoObj.canRedo()) {
+
+                undoStack[++stackPtr].restore();
+
+                if (callback) {
+                    callback();
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Push the input area state to the stack.
+        var saveState = function () {
+            var currState = inputStateObj || new TextareaState(panels);
+
+            if (!currState) {
+                return false;
+            }
+            if (mode == "moving") {
+                if (!lastState) {
+                    lastState = currState;
+                }
+                return;
+            }
+            if (lastState) {
+                if (undoStack[stackPtr - 1].text != lastState.text) {
+                    undoStack[stackPtr++] = lastState;
+                }
+                lastState = null;
+            }
+            undoStack[stackPtr++] = currState;
+            undoStack[stackPtr + 1] = null;
+            if (callback) {
+                callback();
+            }
+        };
+
+        var handleCtrlYZ = function (event) {
+
+            var handled = false;
+
+            if ((event.ctrlKey || event.metaKey) && !event.altKey) {
+
+                // IE and Opera do not support charCode.
+                var keyCode = event.charCode || event.keyCode;
+                var keyCodeChar = String.fromCharCode(keyCode);
+
+                switch (keyCodeChar.toLowerCase()) {
+
+                    case "y":
+                        undoObj.redo();
+                        handled = true;
+                        break;
+
+                    case "z":
+                        if (!event.shiftKey) {
+                            undoObj.undo();
+                        }
+                        else {
+                            undoObj.redo();
+                        }
+                        handled = true;
+                        break;
+                }
+            }
+
+            if (handled) {
+                if (event.preventDefault) {
+                    event.preventDefault();
+                }
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+                return;
+            }
+        };
+
+        // Set the mode depending on what is going on in the input area.
+        var handleModeChange = function (event) {
+
+            if (!event.ctrlKey && !event.metaKey) {
+
+                var keyCode = event.keyCode;
+
+                if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
+                    // 33 - 40: page up/dn and arrow keys
+                    // 63232 - 63235: page up/dn and arrow keys on safari
+                    setMode("moving");
+                }
+                else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
+                    // 8: backspace
+                    // 46: delete
+                    // 127: delete
+                    setMode("deleting");
+                }
+                else if (keyCode == 13) {
+                    // 13: Enter
+                    setMode("newlines");
+                }
+                else if (keyCode == 27) {
+                    // 27: escape
+                    setMode("escape");
+                }
+                else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
+                    // 16-20 are shift, etc.
+                    // 91: left window key
+                    // I think this might be a little messed up since there are
+                    // a lot of nonprinting keys above 20.
+                    setMode("typing");
+                }
+            }
+        };
+
+        var setEventHandlers = function () {
+            util.addEvent(panels.input, "keypress", function (event) {
+                // keyCode 89: y
+                // keyCode 90: z
+                if ((event.ctrlKey || event.metaKey) && !event.altKey && (event.keyCode == 89 || event.keyCode == 90)) {
+                    event.preventDefault();
+                }
+            });
+
+            var handlePaste = function () {
+                if (uaSniffed.isIE || (inputStateObj && inputStateObj.text != panels.input.value)) {
+                    if (timer == undefined) {
+                        mode = "paste";
+                        saveState();
+                        refreshState();
+                    }
+                }
+            };
+
+            util.addEvent(panels.input, "keydown", handleCtrlYZ);
+            util.addEvent(panels.input, "keydown", handleModeChange);
+            util.addEvent(panels.input, "mousedown", function () {
+                setMode("moving");
+            });
+
+            panels.input.onpaste = handlePaste;
+            panels.input.ondrop = handlePaste;
+        };
+
+        var init = function () {
+            setEventHandlers();
+            refreshState(true);
+            saveState();
+        };
+
+        init();
+    }
+
+    // end of UndoManager
+
+    // The input textarea state/contents.
+    // This is used to implement undo/redo by the undo manager.
+    function TextareaState(panels, isInitialState) {
+
+        // Aliases
+        var stateObj = this;
+        var inputArea = panels.input;
+        this.init = function () {
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+            if (!isInitialState && doc.activeElement && doc.activeElement !== inputArea) { // this happens when tabbing out of the input box
+                return;
+            }
+
+            this.setInputAreaSelectionStartEnd();
+            this.scrollTop = inputArea.scrollTop;
+            if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
+                this.text = inputArea.value;
+            }
+
+        }
+
+        // Sets the selected text in the input box after we've performed an
+        // operation.
+        this.setInputAreaSelection = function () {
+
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+
+            if (inputArea.selectionStart !== undefined && !uaSniffed.isOpera) {
+
+                inputArea.focus();
+                inputArea.selectionStart = stateObj.start;
+                inputArea.selectionEnd = stateObj.end;
+                inputArea.scrollTop = stateObj.scrollTop;
+            }
+            else if (doc.selection) {
+
+                if (doc.activeElement && doc.activeElement !== inputArea) {
+                    return;
+                }
+
+                inputArea.focus();
+                var range = inputArea.createTextRange();
+                range.moveStart("character", -inputArea.value.length);
+                range.moveEnd("character", -inputArea.value.length);
+                range.moveEnd("character", stateObj.end);
+                range.moveStart("character", stateObj.start);
+                range.select();
+            }
+        };
+
+        this.setInputAreaSelectionStartEnd = function () {
+
+            if (!panels.ieCachedRange && (inputArea.selectionStart || inputArea.selectionStart === 0)) {
+
+                stateObj.start = inputArea.selectionStart;
+                stateObj.end = inputArea.selectionEnd;
+            }
+            else if (doc.selection) {
+
+                stateObj.text = util.fixEolChars(inputArea.value);
+
+                // IE loses the selection in the textarea when buttons are
+                // clicked.  On IE we cache the selection. Here, if something is cached,
+                // we take it.
+                var range = panels.ieCachedRange || doc.selection.createRange();
+
+                var fixedRange = util.fixEolChars(range.text);
+                var marker = "\x07";
+                var markedRange = marker + fixedRange + marker;
+                range.text = markedRange;
+                var inputText = util.fixEolChars(inputArea.value);
+
+                range.moveStart("character", -markedRange.length);
+                range.text = fixedRange;
+
+                stateObj.start = inputText.indexOf(marker);
+                stateObj.end = inputText.lastIndexOf(marker) - marker.length;
+
+                var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
+
+                if (len) {
+                    range.moveStart("character", -fixedRange.length);
+                    while (len--) {
+                        fixedRange += "\n";
+                        stateObj.end += 1;
+                    }
+                    range.text = fixedRange;
+                }
+
+                if (panels.ieCachedRange)
+                    stateObj.scrollTop = panels.ieCachedScrollTop; // this is set alongside with ieCachedRange
+
+                panels.ieCachedRange = null;
+
+                this.setInputAreaSelection();
+            }
+        };
+
+        // Restore this state into the input area.
+        this.restore = function () {
+
+            if (stateObj.text != undefined && stateObj.text != inputArea.value) {
+                inputArea.value = stateObj.text;
+            }
+            this.setInputAreaSelection();
+            inputArea.scrollTop = stateObj.scrollTop;
+        };
+
+        // Gets a collection of HTML chunks from the inptut textarea.
+        this.getChunks = function () {
+
+            var chunk = new Chunks();
+            chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
+            chunk.startTag = "";
+            chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
+            chunk.endTag = "";
+            chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
+            chunk.scrollTop = stateObj.scrollTop;
+
+            return chunk;
+        };
+
+        // Sets the TextareaState properties given a chunk of markdown.
+        this.setChunks = function (chunk) {
+
+            chunk.before = chunk.before + chunk.startTag;
+            chunk.after = chunk.endTag + chunk.after;
+
+            this.start = chunk.before.length;
+            this.end = chunk.before.length + chunk.selection.length;
+            this.text = chunk.before + chunk.selection + chunk.after;
+            this.scrollTop = chunk.scrollTop;
+        };
+        this.init();
+    };
+
+    function PreviewManager(converter, panels, previewRefreshCallback) {
+
+        var managerObj = this;
+        var timeout;
+        var elapsedTime;
+        var oldInputText;
+        var maxDelay = 3000;
+        var startType = "delayed"; // The other legal value is "manual"
+
+        // Adds event listeners to elements
+        var setupEvents = function (inputElem, listener) {
+
+            util.addEvent(inputElem, "input", listener);
+            inputElem.onpaste = listener;
+            inputElem.ondrop = listener;
+
+            util.addEvent(inputElem, "keypress", listener);
+            util.addEvent(inputElem, "keydown", listener);
+        };
+
+        var getDocScrollTop = function () {
+
+            var result = 0;
+
+            if (window.innerHeight) {
+                result = window.pageYOffset;
+            }
+            else
+                if (doc.documentElement && doc.documentElement.scrollTop) {
+                    result = doc.documentElement.scrollTop;
+                }
+                else
+                    if (doc.body) {
+                        result = doc.body.scrollTop;
+                    }
+
+            return result;
+        };
+
+        var makePreviewHtml = function () {
+
+            // If there is no registered preview panel
+            // there is nothing to do.
+            if (!panels.preview)
+                return;
+
+
+            var text = panels.input.value;
+            if (text && text == oldInputText) {
+                return; // Input text hasn't changed.
+            }
+            else {
+                oldInputText = text;
+            }
+
+            var prevTime = new Date().getTime();
+
+            text = converter.makeHtml(text);
+
+            // Calculate the processing time of the HTML creation.
+            // It's used as the delay time in the event listener.
+            var currTime = new Date().getTime();
+            elapsedTime = currTime - prevTime;
+
+            pushPreviewHtml(text);
+        };
+
+        // setTimeout is already used.  Used as an event listener.
+        var applyTimeout = function () {
+
+            if (timeout) {
+                clearTimeout(timeout);
+                timeout = undefined;
+            }
+
+            if (startType !== "manual") {
+
+                var delay = 0;
+
+                if (startType === "delayed") {
+                    delay = elapsedTime;
+                }
+
+                if (delay > maxDelay) {
+                    delay = maxDelay;
+                }
+                timeout = setTimeout(makePreviewHtml, delay);
+            }
+        };
+
+        var getScaleFactor = function (panel) {
+            if (panel.scrollHeight <= panel.clientHeight) {
+                return 1;
+            }
+            return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
+        };
+
+        var setPanelScrollTops = function () {
+            if (panels.preview) {
+                panels.preview.scrollTop = (panels.preview.scrollHeight - panels.preview.clientHeight) * getScaleFactor(panels.preview);
+            }
+        };
+
+        this.refresh = function (requiresRefresh) {
+
+            if (requiresRefresh) {
+                oldInputText = "";
+                makePreviewHtml();
+            }
+            else {
+                applyTimeout();
+            }
+        };
+
+        this.processingTime = function () {
+            return elapsedTime;
+        };
+
+        var isFirstTimeFilled = true;
+
+        // IE doesn't let you use innerHTML if the element is contained somewhere in a table
+        // (which is the case for inline editing) -- in that case, detach the element, set the
+        // value, and reattach. Yes, that *is* ridiculous.
+        var ieSafePreviewSet = function (text) {
+            var preview = panels.preview;
+            var parent = preview.parentNode;
+            var sibling = preview.nextSibling;
+            parent.removeChild(preview);
+            preview.innerHTML = text;
+            if (!sibling)
+                parent.appendChild(preview);
+            else
+                parent.insertBefore(preview, sibling);
+        }
+
+        var nonSuckyBrowserPreviewSet = function (text) {
+            panels.preview.innerHTML = text;
+        }
+
+        var previewSetter;
+
+        var previewSet = function (text) {
+            if (previewSetter)
+                return previewSetter(text);
+
+            try {
+                nonSuckyBrowserPreviewSet(text);
+                previewSetter = nonSuckyBrowserPreviewSet;
+            } catch (e) {
+                previewSetter = ieSafePreviewSet;
+                previewSetter(text);
+            }
+        };
+
+        var pushPreviewHtml = function (text) {
+
+            var emptyTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (panels.preview) {
+                previewSet(text);
+                previewRefreshCallback();
+            }
+
+            setPanelScrollTops();
+
+            if (isFirstTimeFilled) {
+                isFirstTimeFilled = false;
+                return;
+            }
+
+            var fullTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (uaSniffed.isIE) {
+                setTimeout(function () {
+                    window.scrollBy(0, fullTop - emptyTop);
+                }, 0);
+            }
+            else {
+                window.scrollBy(0, fullTop - emptyTop);
+            }
+        };
+
+        var init = function () {
+
+            setupEvents(panels.input, applyTimeout);
+            makePreviewHtml();
+
+            if (panels.preview) {
+                panels.preview.scrollTop = 0;
+            }
+        };
+
+        init();
+    };
+
+    // Creates the background behind the hyperlink text entry box.
+    // And download dialog
+    // Most of this has been moved to CSS but the div creation and
+    // browser-specific hacks remain here.
+    ui.createBackground = function () {
+
+        var background = doc.createElement("div"),
+            style = background.style;
+        
+        background.className = "wmd-prompt-background";
+        
+        style.position = "absolute";
+        style.top = "0";
+
+        style.zIndex = "1000";
+
+        if (uaSniffed.isIE) {
+            style.filter = "alpha(opacity=50)";
+        }
+        else {
+            style.opacity = "0.5";
+        }
+
+        var pageSize = position.getPageSize();
+        style.height = pageSize[1] + "px";
+
+        if (uaSniffed.isIE) {
+            style.left = doc.documentElement.scrollLeft;
+            style.width = doc.documentElement.clientWidth;
+        }
+        else {
+            style.left = "0";
+            style.width = "100%";
+        }
+
+        doc.body.appendChild(background);
+        return background;
+    };
+
+    // This simulates a modal dialog box and asks for the URL when you
+    // click the hyperlink or image buttons.
+    //
+    // text: The html for the input box.
+    // defaultInputText: The default value that appears in the input box.
+    // callback: The function which is executed when the prompt is dismissed, either via OK or Cancel.
+    //      It receives a single argument; either the entered text (if OK was chosen) or null (if Cancel
+    //      was chosen).
+    ui.prompt = function (text, defaultInputText, callback) {
+
+        // These variables need to be declared at this level since they are used
+        // in multiple functions.
+        var dialog;         // The dialog box.
+        var input;         // The text box where you enter the hyperlink.
+
+
+        if (defaultInputText === undefined) {
+            defaultInputText = "";
+        }
+
+        // Used as a keydown event handler. Esc dismisses the prompt.
+        // Key code 27 is ESC.
+        var checkEscape = function (key) {
+            var code = (key.charCode || key.keyCode);
+            if (code === 27) {
+                if (key.stopPropagation) key.stopPropagation();
+                close(true);
+                return false;
+            }
+        };
+
+        // Dismisses the hyperlink input box.
+        // isCancel is true if we don't care about the input text.
+        // isCancel is false if we are going to keep the text.
+        var close = function (isCancel) {
+            util.removeEvent(doc.body, "keyup", checkEscape);
+            var text = input.value;
+
+            if (isCancel) {
+                text = null;
+            }
+            else {
+                // Fixes common pasting errors.
+                text = text.replace(/^http:\/\/(https?|ftp):\/\//, '$1://');
+                if (!/^(?:https?|ftp):\/\//.test(text))
+                    text = 'http://' + text;
+            }
+
+            dialog.parentNode.removeChild(dialog);
+
+            callback(text);
+            return false;
+        };
+
+
+
+        // Create the text input box form/window.
+        var createDialog = function () {
+
+            // The main dialog box.
+            dialog = doc.createElement("div");
+            dialog.className = "wmd-prompt-dialog";
+            dialog.style.padding = "10px;";
+            dialog.style.position = "fixed";
+            dialog.style.width = "400px";
+            dialog.style.zIndex = "1001";
+
+            // The dialog text.
+            var question = doc.createElement("div");
+            question.innerHTML = text;
+            question.style.padding = "5px";
+            dialog.appendChild(question);
+
+            // The web form container for the text box and buttons.
+            var form = doc.createElement("form"),
+                style = form.style;
+            form.onsubmit = function () { return close(false); };
+            style.padding = "0";
+            style.margin = "0";
+            style.cssFloat = "left";
+            style.width = "100%";
+            style.textAlign = "center";
+            style.position = "relative";
+            dialog.appendChild(form);
+
+            // The input text box
+            input = doc.createElement("input");
+            input.type = "text";
+            input.value = defaultInputText;
+            style = input.style;
+            style.display = "block";
+            style.width = "80%";
+            style.marginLeft = style.marginRight = "auto";
+            form.appendChild(input);
+
+            // The ok button
+            var okButton = doc.createElement("input");
+            okButton.type = "button";
+            okButton.onclick = function () { return close(false); };
+            okButton.value = "OK";
+            style = okButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+
+
+            // The cancel button
+            var cancelButton = doc.createElement("input");
+            cancelButton.type = "button";
+            cancelButton.onclick = function () { return close(true); };
+            cancelButton.value = "Cancel";
+            style = cancelButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+
+            form.appendChild(okButton);
+            form.appendChild(cancelButton);
+
+            util.addEvent(doc.body, "keyup", checkEscape);
+            dialog.style.top = "50%";
+            dialog.style.left = "50%";
+            dialog.style.display = "block";
+            if (uaSniffed.isIE_5or6) {
+                dialog.style.position = "absolute";
+                dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
+                dialog.style.left = "50%";
+            }
+            doc.body.appendChild(dialog);
+
+            // This has to be done AFTER adding the dialog to the form if you
+            // want it to be centered.
+            dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
+            dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
+
+        };
+
+        // Why is this in a zero-length timeout?
+        // Is it working around a browser bug?
+        setTimeout(function () {
+
+            createDialog();
+
+            var defTextLen = defaultInputText.length;
+            if (input.selectionStart !== undefined) {
+                input.selectionStart = 0;
+                input.selectionEnd = defTextLen;
+            }
+            else if (input.createTextRange) {
+                var range = input.createTextRange();
+                range.collapse(false);
+                range.moveStart("character", -defTextLen);
+                range.moveEnd("character", defTextLen);
+                range.select();
+            }
+
+            input.focus();
+        }, 0);
+    };
+
+    function UIManager(postfix, panels, undoManager, previewManager, commandManager, helpOptions, getString) {
+
+        var inputBox = panels.input,
+            buttons = {}; // buttons.undo, buttons.link, etc. The actual DOM elements.
+
+        makeSpritedButtonRow();
+
+        var keyEvent = "keydown";
+        if (uaSniffed.isOpera) {
+            keyEvent = "keypress";
+        }
+
+        util.addEvent(inputBox, keyEvent, function (key) {
+
+            // Check to see if we have a button key and, if so execute the callback.
+            if ((key.ctrlKey || key.metaKey) && !key.altKey && !key.shiftKey) {
+
+                var keyCode = key.charCode || key.keyCode;
+                var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
+
+                switch (keyCodeStr) {
+                    case "b":
+                        doClick(buttons.bold);
+                        break;
+                    case "i":
+                        doClick(buttons.italic);
+                        break;
+                    case "l":
+                        doClick(buttons.link);
+                        break;
+                    case "q":
+                        doClick(buttons.quote);
+                        break;
+                    case "k":
+                        doClick(buttons.code);
+                        break;
+                    case "g":
+                        doClick(buttons.image);
+                        break;
+                    case "o":
+                        doClick(buttons.olist);
+                        break;
+                    case "u":
+                        doClick(buttons.ulist);
+                        break;
+                    case "h":
+                        doClick(buttons.heading);
+                        break;
+                    case "r":
+                        doClick(buttons.hr);
+                        break;
+                    case "y":
+                        doClick(buttons.redo);
+                        break;
+                    case "z":
+                        if (key.shiftKey) {
+                            doClick(buttons.redo);
+                        }
+                        else {
+                            doClick(buttons.undo);
+                        }
+                        break;
+                    default:
+                        return;
+                }
+
+
+                if (key.preventDefault) {
+                    key.preventDefault();
+                }
+
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+            }
+        });
+
+        // Auto-indent on shift-enter
+        util.addEvent(inputBox, "keyup", function (key) {
+            if (key.shiftKey && !key.ctrlKey && !key.metaKey) {
+                var keyCode = key.charCode || key.keyCode;
+                // Character 13 is Enter
+                if (keyCode === 13) {
+                    var fakeButton = {};
+                    fakeButton.textOp = bindCommand("doAutoindent");
+                    doClick(fakeButton);
+                }
+            }
+        });
+
+        // special handler because IE clears the context of the textbox on ESC
+        if (uaSniffed.isIE) {
+            util.addEvent(inputBox, "keydown", function (key) {
+                var code = key.keyCode;
+                if (code === 27) {
+                    return false;
+                }
+            });
+        }
+
+
+        // Perform the button's action.
+        function doClick(button) {
+
+            inputBox.focus();
+
+            if (button.textOp) {
+
+                if (undoManager) {
+                    undoManager.setCommandMode();
+                }
+
+                var state = new TextareaState(panels);
+
+                if (!state) {
+                    return;
+                }
+
+                var chunks = state.getChunks();
+
+                // Some commands launch a "modal" prompt dialog.  Javascript
+                // can't really make a modal dialog box and the WMD code
+                // will continue to execute while the dialog is displayed.
+                // This prevents the dialog pattern I'm used to and means
+                // I can't do something like this:
+                //
+                // var link = CreateLinkDialog();
+                // makeMarkdownLink(link);
+                //
+                // Instead of this straightforward method of handling a
+                // dialog I have to pass any code which would execute
+                // after the dialog is dismissed (e.g. link creation)
+                // in a function parameter.
+                //
+                // Yes this is awkward and I think it sucks, but there's
+                // no real workaround.  Only the image and link code
+                // create dialogs and require the function pointers.
+                var fixupInputArea = function () {
+
+                    inputBox.focus();
+
+                    if (chunks) {
+                        state.setChunks(chunks);
+                    }
+
+                    state.restore();
+                    previewManager.refresh();
+                };
+
+                var noCleanup = button.textOp(chunks, fixupInputArea);
+
+                if (!noCleanup) {
+                    fixupInputArea();
+                }
+
+            }
+
+            if (button.execute) {
+                button.execute(undoManager);
+            }
+        };
+
+        function setupButton(button, isEnabled) {
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+            var image = button.getElementsByTagName("span")[0];
+            if (isEnabled) {
+                image.style.backgroundPosition = button.XShift + " " + normalYShift;
+                button.onmouseover = function () {
+                    image.style.backgroundPosition = this.XShift + " " + highlightYShift;
+                };
+
+                button.onmouseout = function () {
+                    image.style.backgroundPosition = this.XShift + " " + normalYShift;
+                };
+
+                // IE tries to select the background image "button" text (it's
+                // implemented in a list item) so we have to cache the selection
+                // on mousedown.
+                if (uaSniffed.isIE) {
+                    button.onmousedown = function () {
+                        if (doc.activeElement && doc.activeElement !== panels.input) { // we're not even in the input box, so there's no selection
+                            return;
+                        }
+                        panels.ieCachedRange = document.selection.createRange();
+                        panels.ieCachedScrollTop = panels.input.scrollTop;
+                    };
+                }
+
+                if (!button.isHelp) {
+                    button.onclick = function () {
+                        if (this.onmouseout) {
+                            this.onmouseout();
+                        }
+                        doClick(this);
+                        return false;
+                    }
+                }
+            }
+            else {
+                image.style.backgroundPosition = button.XShift + " " + disabledYShift;
+                button.onmouseover = button.onmouseout = button.onclick = function () { };
+            }
+        }
+
+        function bindCommand(method) {
+            if (typeof method === "string")
+                method = commandManager[method];
+            return function () { method.apply(commandManager, arguments); }
+        }
+
+        function makeSpritedButtonRow() {
+
+            var buttonBar = panels.buttonBar;
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+
+            var buttonRow = document.createElement("ul");
+            buttonRow.id = "wmd-button-row" + postfix;
+            buttonRow.className = 'wmd-button-row';
+            buttonRow = buttonBar.appendChild(buttonRow);
+            var xPosition = 0;
+            var makeButton = function (id, title, XShift, textOp) {
+                var button = document.createElement("li");
+                button.className = "wmd-button";
+                button.style.left = xPosition + "px";
+                xPosition += 25;
+                var buttonImage = document.createElement("span");
+                button.id = id + postfix;
+                button.appendChild(buttonImage);
+                button.title = title;
+                button.XShift = XShift;
+                if (textOp)
+                    button.textOp = textOp;
+                setupButton(button, true);
+                buttonRow.appendChild(button);
+                return button;
+            };
+            var makeSpacer = function (num) {
+                var spacer = document.createElement("li");
+                spacer.className = "wmd-spacer wmd-spacer" + num;
+                spacer.id = "wmd-spacer" + num + postfix;
+                buttonRow.appendChild(spacer);
+                xPosition += 25;
+            }
+
+            buttons.bold = makeButton("wmd-bold-button", getString("bold"), "0px", bindCommand("doBold"));
+            buttons.italic = makeButton("wmd-italic-button", getString("italic"), "-20px", bindCommand("doItalic"));
+            makeSpacer(1);
+            buttons.link = makeButton("wmd-link-button", getString("link"), "-40px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, false);
+            }));
+            buttons.quote = makeButton("wmd-quote-button", getString("quote"), "-60px", bindCommand("doBlockquote"));
+            buttons.code = makeButton("wmd-code-button", getString("code"), "-80px", bindCommand("doCode"));
+            buttons.image = makeButton("wmd-image-button", getString("image"), "-100px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, true);
+            }));
+            makeSpacer(2);
+            buttons.olist = makeButton("wmd-olist-button", getString("olist"), "-120px", bindCommand(function (chunk, postProcessing) {
+                this.doList(chunk, postProcessing, true);
+            }));
+            buttons.ulist = makeButton("wmd-ulist-button", getString("ulist"), "-140px", bindCommand(function (chunk, postProcessing) {
+                this.doList(chunk, postProcessing, false);
+            }));
+            buttons.heading = makeButton("wmd-heading-button", getString("heading"), "-160px", bindCommand("doHeading"));
+            buttons.hr = makeButton("wmd-hr-button", getString("hr"), "-180px", bindCommand("doHorizontalRule"));
+            makeSpacer(3);
+            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "-200px", null);
+            buttons.undo.execute = function (manager) { if (manager) manager.undo(); };
+
+            var redoTitle = /win/.test(nav.platform.toLowerCase()) ?
+                getString("redo") :
+                getString("redomac"); // mac and other non-Windows platforms
+
+            buttons.redo = makeButton("wmd-redo-button", redoTitle, "-220px", null);
+            buttons.redo.execute = function (manager) { if (manager) manager.redo(); };
+
+            if (helpOptions) {
+                var helpButton = document.createElement("li");
+                var helpButtonImage = document.createElement("span");
+                helpButton.appendChild(helpButtonImage);
+                helpButton.className = "wmd-button wmd-help-button";
+                helpButton.id = "wmd-help-button" + postfix;
+                helpButton.XShift = "-240px";
+                helpButton.isHelp = true;
+                helpButton.style.right = "0px";
+                helpButton.title = getString("help");
+                helpButton.onclick = helpOptions.handler;
+
+                setupButton(helpButton, true);
+                buttonRow.appendChild(helpButton);
+                buttons.help = helpButton;
+            }
+
+            setUndoRedoButtonStates();
+        }
+
+        function setUndoRedoButtonStates() {
+            if (undoManager) {
+                setupButton(buttons.undo, undoManager.canUndo());
+                setupButton(buttons.redo, undoManager.canRedo());
+            }
+        };
+
+        this.setUndoRedoButtonStates = setUndoRedoButtonStates;
+
+    }
+
+    function CommandManager(pluginHooks, getString) {
+        this.hooks = pluginHooks;
+        this.getString = getString;
+    }
+
+    var commandProto = CommandManager.prototype;
+
+    // The markdown symbols - 4 spaces = code, > = blockquote, etc.
+    commandProto.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";
+
+    // Remove markdown symbols from the chunk selection.
+    commandProto.unwrap = function (chunk) {
+        var txt = new re("([^\\n])\\n(?!(\\n|" + this.prefixes + "))", "g");
+        chunk.selection = chunk.selection.replace(txt, "$1 $2");
+    };
+
+    commandProto.wrap = function (chunk, len) {
+        this.unwrap(chunk);
+        var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm"),
+            that = this;
+
+        chunk.selection = chunk.selection.replace(regex, function (line, marked) {
+            if (new re("^" + that.prefixes, "").test(line)) {
+                return line;
+            }
+            return marked + "\n";
+        });
+
+        chunk.selection = chunk.selection.replace(/\s+$/, "");
+    };
+
+    commandProto.doBold = function (chunk, postProcessing) {
+        return this.doBorI(chunk, postProcessing, 2, this.getString("boldexample"));
+    };
+
+    commandProto.doItalic = function (chunk, postProcessing) {
+        return this.doBorI(chunk, postProcessing, 1, this.getString("italicexample"));
+    };
+
+    // chunk: The selected region that will be enclosed with */**
+    // nStars: 1 for italics, 2 for bold
+    // insertText: If you just click the button without highlighting text, this gets inserted
+    commandProto.doBorI = function (chunk, postProcessing, nStars, insertText) {
+
+        // Get rid of whitespace and fixup newlines.
+        chunk.trimWhitespace();
+        chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");
+
+        // Look for stars before and after.  Is the chunk already marked up?
+        // note that these regex matches cannot fail
+        var starsBefore = /(\**$)/.exec(chunk.before)[0];
+        var starsAfter = /(^\**)/.exec(chunk.after)[0];
+
+        var prevStars = Math.min(starsBefore.length, starsAfter.length);
+
+        // Remove stars if we have to since the button acts as a toggle.
+        if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
+            chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
+            chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
+        }
+        else if (!chunk.selection && starsAfter) {
+            // It's not really clear why this code is necessary.  It just moves
+            // some arbitrary stuff around.
+            chunk.after = chunk.after.replace(/^([*_]*)/, "");
+            chunk.before = chunk.before.replace(/(\s?)$/, "");
+            var whitespace = re.$1;
+            chunk.before = chunk.before + starsAfter + whitespace;
+        }
+        else {
+
+            // In most cases, if you don't have any selected text and click the button
+            // you'll get a selected, marked up region with the default text inserted.
+            if (!chunk.selection && !starsAfter) {
+                chunk.selection = insertText;
+            }
+
+            // Add the true markup.
+            var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
+            chunk.before = chunk.before + markup;
+            chunk.after = markup + chunk.after;
+        }
+
+        return;
+    };
+
+    commandProto.stripLinkDefs = function (text, defsToAdd) {
+
+        text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
+            function (totalMatch, id, link, newlines, title) {
+                defsToAdd[id] = totalMatch.replace(/\s*$/, "");
+                if (newlines) {
+                    // Strip the title and return that separately.
+                    defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
+                    return newlines + title;
+                }
+                return "";
+            });
+
+        return text;
+    };
+
+    commandProto.addLinkDef = function (chunk, linkDef) {
+
+        var refNumber = 0; // The current reference number
+        var defsToAdd = {}; //
+        // Start with a clean slate by removing all previous link definitions.
+        chunk.before = this.stripLinkDefs(chunk.before, defsToAdd);
+        chunk.selection = this.stripLinkDefs(chunk.selection, defsToAdd);
+        chunk.after = this.stripLinkDefs(chunk.after, defsToAdd);
+
+        var defs = "";
+        var regex = /(\[)((?:\[[^\]]*\]|[^\[\]])*)(\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
+
+        var addDefNumber = function (def) {
+            refNumber++;
+            def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
+            defs += "\n" + def;
+        };
+
+        // note that
+        // a) the recursive call to getLink cannot go infinite, because by definition
+        //    of regex, inner is always a proper substring of wholeMatch, and
+        // b) more than one level of nesting is neither supported by the regex
+        //    nor making a lot of sense (the only use case for nesting is a linked image)
+        var getLink = function (wholeMatch, before, inner, afterInner, id, end) {
+            inner = inner.replace(regex, getLink);
+            if (defsToAdd[id]) {
+                addDefNumber(defsToAdd[id]);
+                return before + inner + afterInner + refNumber + end;
+            }
+            return wholeMatch;
+        };
+
+        chunk.before = chunk.before.replace(regex, getLink);
+
+        if (linkDef) {
+            addDefNumber(linkDef);
+        }
+        else {
+            chunk.selection = chunk.selection.replace(regex, getLink);
+        }
+
+        var refOut = refNumber;
+
+        chunk.after = chunk.after.replace(regex, getLink);
+
+        if (chunk.after) {
+            chunk.after = chunk.after.replace(/\n*$/, "");
+        }
+        if (!chunk.after) {
+            chunk.selection = chunk.selection.replace(/\n*$/, "");
+        }
+
+        chunk.after += "\n\n" + defs;
+
+        return refOut;
+    };
+
+    // takes the line as entered into the add link/as image dialog and makes
+    // sure the URL and the optinal title are "nice".
+    function properlyEncoded(linkdef) {
+        return linkdef.replace(/^\s*(.*?)(?:\s+"(.+)")?\s*$/, function (wholematch, link, title) {
+            
+            var inQueryString = false;
+
+            // Having `[^\w\d-./]` in there is just a shortcut that lets us skip
+            // the most common characters in URLs. Replacing that it with `.` would not change
+            // the result, because encodeURI returns those characters unchanged, but it
+            // would mean lots of unnecessary replacement calls. Having `[` and `]` in that
+            // section as well means we do *not* enocde square brackets. These characters are
+            // a strange beast in URLs, but if anything, this causes URLs to be more readable,
+            // and we leave it to the browser to make sure that these links are handled without
+            // problems.
+            link = link.replace(/%(?:[\da-fA-F]{2})|\?|\+|[^\w\d-./[\]]/g, function (match) {
+                // Valid percent encoding. Could just return it as is, but we follow RFC3986
+                // Section 2.1 which says "For consistency, URI producers and normalizers
+                // should use uppercase hexadecimal digits for all percent-encodings."
+                // Note that we also handle (illegal) stand-alone percent characters by
+                // replacing them with "%25"
+                if (match.length === 3 && match.charAt(0) == "%") {
+                    return match.toUpperCase();
+                }
+                switch (match) {
+                    case "?":
+                        inQueryString = true;
+                        return "?";
+                        break;
+                    
+                    // In the query string, a plus and a space are identical -- normalize.
+                    // Not strictly necessary, but identical behavior to the previous version
+                    // of this function.
+                    case "+":
+                        if (inQueryString)
+                            return "%20";
+                        break;
+                }
+                return encodeURI(match);
+            })
+            
+            if (title) {
+                title = title.trim ? title.trim() : title.replace(/^\s*/, "").replace(/\s*$/, "");
+                title = title.replace(/"/g, "quot;").replace(/\(/g, "&#40;").replace(/\)/g, "&#41;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+            }
+            return title ? link + ' "' + title + '"' : link;
+        });
+    }
+
+    commandProto.doLinkOrImage = function (chunk, postProcessing, isImage) {
+
+        chunk.trimWhitespace();
+        chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
+        var background;
+
+        if (chunk.endTag.length > 1 && chunk.startTag.length > 0) {
+
+            chunk.startTag = chunk.startTag.replace(/!?\[/, "");
+            chunk.endTag = "";
+            this.addLinkDef(chunk, null);
+
+        }
+        else {
+            
+            // We're moving start and end tag back into the selection, since (as we're in the else block) we're not
+            // *removing* a link, but *adding* one, so whatever findTags() found is now back to being part of the
+            // link text. linkEnteredCallback takes care of escaping any brackets.
+            chunk.selection = chunk.startTag + chunk.selection + chunk.endTag;
+            chunk.startTag = chunk.endTag = "";
+
+            if (/\n\n/.test(chunk.selection)) {
+                this.addLinkDef(chunk, null);
+                return;
+            }
+            var that = this;
+            // The function to be executed when you enter a link and press OK or Cancel.
+            // Marks up the link and adds the ref.
+            var linkEnteredCallback = function (link) {
+
+                background.parentNode.removeChild(background);
+
+                if (link !== null) {
+                    // (                          $1
+                    //     [^\\]                  anything that's not a backslash
+                    //     (?:\\\\)*              an even number (this includes zero) of backslashes
+                    // )
+                    // (?=                        followed by
+                    //     [[\]]                  an opening or closing bracket
+                    // )
+                    //
+                    // In other words, a non-escaped bracket. These have to be escaped now to make sure they
+                    // don't count as the end of the link or similar.
+                    // Note that the actual bracket has to be a lookahead, because (in case of to subsequent brackets),
+                    // the bracket in one match may be the "not a backslash" character in the next match, so it
+                    // should not be consumed by the first match.
+                    // The "prepend a space and finally remove it" steps makes sure there is a "not a backslash" at the
+                    // start of the string, so this also works if the selection begins with a bracket. We cannot solve
+                    // this by anchoring with ^, because in the case that the selection starts with two brackets, this
+                    // would mean a zero-width match at the start. Since zero-width matches advance the string position,
+                    // the first bracket could then not act as the "not a backslash" for the second.
+                    chunk.selection = (" " + chunk.selection).replace(/([^\\](?:\\\\)*)(?=[[\]])/g, "$1\\").substr(1);
+                    
+                    var linkDef = " [999]: " + properlyEncoded(link);
+
+                    var num = that.addLinkDef(chunk, linkDef);
+                    chunk.startTag = isImage ? "![" : "[";
+                    chunk.endTag = "][" + num + "]";
+
+                    if (!chunk.selection) {
+                        if (isImage) {
+                            chunk.selection = that.getString("imagedescription");
+                        }
+                        else {
+                            chunk.selection = that.getString("linkdescription");
+                        }
+                    }
+                }
+                postProcessing();
+            };
+
+            background = ui.createBackground();
+
+            if (isImage) {
+                if (!this.hooks.insertImageDialog(linkEnteredCallback))
+                    ui.prompt(this.getString("imagedialog"), imageDefaultText, linkEnteredCallback);
+            }
+            else {
+                ui.prompt(this.getString("linkdialog"), linkDefaultText, linkEnteredCallback);
+            }
+            return true;
+        }
+    };
+
+    // When making a list, hitting shift-enter will put your cursor on the next line
+    // at the current indent level.
+    commandProto.doAutoindent = function (chunk, postProcessing) {
+
+        var commandMgr = this,
+            fakeSelection = false;
+
+        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
+        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
+        chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
+        
+        // There's no selection, end the cursor wasn't at the end of the line:
+        // The user wants to split the current list item / code line / blockquote line
+        // (for the latter it doesn't really matter) in two. Temporarily select the
+        // (rest of the) line to achieve this.
+        if (!chunk.selection && !/^[ \t]*(?:\n|$)/.test(chunk.after)) {
+            chunk.after = chunk.after.replace(/^[^\n]*/, function (wholeMatch) {
+                chunk.selection = wholeMatch;
+                return "";
+            });
+            fakeSelection = true;
+        }
+
+        if (/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]+.*\n$/.test(chunk.before)) {
+            if (commandMgr.doList) {
+                commandMgr.doList(chunk);
+            }
+        }
+        if (/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)) {
+            if (commandMgr.doBlockquote) {
+                commandMgr.doBlockquote(chunk);
+            }
+        }
+        if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
+            if (commandMgr.doCode) {
+                commandMgr.doCode(chunk);
+            }
+        }
+        
+        if (fakeSelection) {
+            chunk.after = chunk.selection + chunk.after;
+            chunk.selection = "";
+        }
+    };
+
+    commandProto.doBlockquote = function (chunk, postProcessing) {
+
+        chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
+            function (totalMatch, newlinesBefore, text, newlinesAfter) {
+                chunk.before += newlinesBefore;
+                chunk.after = newlinesAfter + chunk.after;
+                return text;
+            });
+
+        chunk.before = chunk.before.replace(/(>[ \t]*)$/,
+            function (totalMatch, blankLine) {
+                chunk.selection = blankLine + chunk.selection;
+                return "";
+            });
+
+        chunk.selection = chunk.selection.replace(/^(\s|>)+$/, "");
+        chunk.selection = chunk.selection || this.getString("quoteexample");
+
+        // The original code uses a regular expression to find out how much of the
+        // text *directly before* the selection already was a blockquote:
+
+        /*
+        if (chunk.before) {
+        chunk.before = chunk.before.replace(/\n?$/, "\n");
+        }
+        chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
+        function (totalMatch) {
+        chunk.startTag = totalMatch;
+        return "";
+        });
+        */
+
+        // This comes down to:
+        // Go backwards as many lines a possible, such that each line
+        //  a) starts with ">", or
+        //  b) is almost empty, except for whitespace, or
+        //  c) is preceeded by an unbroken chain of non-empty lines
+        //     leading up to a line that starts with ">" and at least one more character
+        // and in addition
+        //  d) at least one line fulfills a)
+        //
+        // Since this is essentially a backwards-moving regex, it's susceptible to
+        // catstrophic backtracking and can cause the browser to hang;
+        // see e.g. http://meta.stackexchange.com/questions/9807.
+        //
+        // Hence we replaced this by a simple state machine that just goes through the
+        // lines and checks for a), b), and c).
+
+        var match = "",
+            leftOver = "",
+            line;
+        if (chunk.before) {
+            var lines = chunk.before.replace(/\n$/, "").split("\n");
+            var inChain = false;
+            for (var i = 0; i < lines.length; i++) {
+                var good = false;
+                line = lines[i];
+                inChain = inChain && line.length > 0; // c) any non-empty line continues the chain
+                if (/^>/.test(line)) {                // a)
+                    good = true;
+                    if (!inChain && line.length > 1)  // c) any line that starts with ">" and has at least one more character starts the chain
+                        inChain = true;
+                } else if (/^[ \t]*$/.test(line)) {   // b)
+                    good = true;
+                } else {
+                    good = inChain;                   // c) the line is not empty and does not start with ">", so it matches if and only if we're in the chain
+                }
+                if (good) {
+                    match += line + "\n";
+                } else {
+                    leftOver += match + line;
+                    match = "\n";
+                }
+            }
+            if (!/(^|\n)>/.test(match)) {             // d)
+                leftOver += match;
+                match = "";
+            }
+        }
+
+        chunk.startTag = match;
+        chunk.before = leftOver;
+
+        // end of change
+
+        if (chunk.after) {
+            chunk.after = chunk.after.replace(/^\n?/, "\n");
+        }
+
+        chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
+            function (totalMatch) {
+                chunk.endTag = totalMatch;
+                return "";
+            }
+        );
+
+        var replaceBlanksInTags = function (useBracket) {
+
+            var replacement = useBracket ? "> " : "";
+
+            if (chunk.startTag) {
+                chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
+                    function (totalMatch, markdown) {
+                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
+                    });
+            }
+            if (chunk.endTag) {
+                chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
+                    function (totalMatch, markdown) {
+                        return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
+                    });
+            }
+        };
+
+        if (/^(?![ ]{0,3}>)/m.test(chunk.selection)) {
+            this.wrap(chunk, SETTINGS.lineLength - 2);
+            chunk.selection = chunk.selection.replace(/^/gm, "> ");
+            replaceBlanksInTags(true);
+            chunk.skipLines();
+        } else {
+            chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
+            this.unwrap(chunk);
+            replaceBlanksInTags(false);
+
+            if (!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag) {
+                chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
+            }
+
+            if (!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag) {
+                chunk.endTag = chunk.endTag.replace(/^\n{0,2}/, "\n\n");
+            }
+        }
+
+        chunk.selection = this.hooks.postBlockquoteCreation(chunk.selection);
+
+        if (!/\n/.test(chunk.selection)) {
+            chunk.selection = chunk.selection.replace(/^(> *)/,
+            function (wholeMatch, blanks) {
+                chunk.startTag += blanks;
+                return "";
+            });
+        }
+    };
+
+    commandProto.doCode = function (chunk, postProcessing) {
+
+        var hasTextBefore = /\S[ ]*$/.test(chunk.before);
+        var hasTextAfter = /^[ ]*\S/.test(chunk.after);
+
+        // Use 'four space' markdown if the selection is on its own
+        // line or is multiline.
+        if ((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)) {
+
+            chunk.before = chunk.before.replace(/[ ]{4}$/,
+                function (totalMatch) {
+                    chunk.selection = totalMatch + chunk.selection;
+                    return "";
+                });
+
+            var nLinesBack = 1;
+            var nLinesForward = 1;
+
+            if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
+                nLinesBack = 0;
+            }
+            if (/^\n(\t|[ ]{4,})/.test(chunk.after)) {
+                nLinesForward = 0;
+            }
+
+            chunk.skipLines(nLinesBack, nLinesForward);
+
+            if (!chunk.selection) {
+                chunk.startTag = "    ";
+                chunk.selection = this.getString("codeexample");
+            }
+            else {
+                if (/^[ ]{0,3}\S/m.test(chunk.selection)) {
+                    if (/\n/.test(chunk.selection))
+                        chunk.selection = chunk.selection.replace(/^/gm, "    ");
+                    else // if it's not multiline, do not select the four added spaces; this is more consistent with the doList behavior
+                        chunk.before += "    ";
+                }
+                else {
+                    chunk.selection = chunk.selection.replace(/^(?:[ ]{4}|[ ]{0,3}\t)/gm, "");
+                }
+            }
+        }
+        else {
+            // Use backticks (`) to delimit the code block.
+
+            chunk.trimWhitespace();
+            chunk.findTags(/`/, /`/);
+
+            if (!chunk.startTag && !chunk.endTag) {
+                chunk.startTag = chunk.endTag = "`";
+                if (!chunk.selection) {
+                    chunk.selection = this.getString("codeexample");
+                }
+            }
+            else if (chunk.endTag && !chunk.startTag) {
+                chunk.before += chunk.endTag;
+                chunk.endTag = "";
+            }
+            else {
+                chunk.startTag = chunk.endTag = "";
+            }
+        }
+    };
+
+    commandProto.doList = function (chunk, postProcessing, isNumberedList) {
+
+        // These are identical except at the very beginning and end.
+        // Should probably use the regex extension function to make this clearer.
+        var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
+        var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;
+
+        // The default bullet is a dash but others are possible.
+        // This has nothing to do with the particular HTML bullet,
+        // it's just a markdown bullet.
+        var bullet = "-";
+
+        // The number in a numbered list.
+        var num = 1;
+
+        // Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
+        var getItemPrefix = function () {
+            var prefix;
+            if (isNumberedList) {
+                prefix = " " + num + ". ";
+                num++;
+            }
+            else {
+                prefix = " " + bullet + " ";
+            }
+            return prefix;
+        };
+
+        // Fixes the prefixes of the other list items.
+        var getPrefixedItem = function (itemText) {
+
+            // The numbering flag is unset when called by autoindent.
+            if (isNumberedList === undefined) {
+                isNumberedList = /^\s*\d/.test(itemText);
+            }
+
+            // Renumber/bullet the list element.
+            itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
+                function (_) {
+                    return getItemPrefix();
+                });
+
+            return itemText;
+        };
+
+        chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);
+
+        if (chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)) {
+            chunk.before += chunk.startTag;
+            chunk.startTag = "";
+        }
+
+        if (chunk.startTag) {
+
+            var hasDigits = /\d+[.]/.test(chunk.startTag);
+            chunk.startTag = "";
+            chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
+            this.unwrap(chunk);
+            chunk.skipLines();
+
+            if (hasDigits) {
+                // Have to renumber the bullet points if this is a numbered list.
+                chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
+            }
+            if (isNumberedList == hasDigits) {
+                return;
+            }
+        }
+
+        var nLinesUp = 1;
+
+        chunk.before = chunk.before.replace(previousItemsRegex,
+            function (itemText) {
+                if (/^\s*([*+-])/.test(itemText)) {
+                    bullet = re.$1;
+                }
+                nLinesUp = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
+                return getPrefixedItem(itemText);
+            });
+
+        if (!chunk.selection) {
+            chunk.selection = this.getString("litem");
+        }
+
+        var prefix = getItemPrefix();
+
+        var nLinesDown = 1;
+
+        chunk.after = chunk.after.replace(nextItemsRegex,
+            function (itemText) {
+                nLinesDown = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
+                return getPrefixedItem(itemText);
+            });
+
+        chunk.trimWhitespace(true);
+        chunk.skipLines(nLinesUp, nLinesDown, true);
+        chunk.startTag = prefix;
+        var spaces = prefix.replace(/./g, " ");
+        this.wrap(chunk, SETTINGS.lineLength - spaces.length);
+        chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);
+
+    };
+
+    commandProto.doHeading = function (chunk, postProcessing) {
+
+        // Remove leading/trailing whitespace and reduce internal spaces to single spaces.
+        chunk.selection = chunk.selection.replace(/\s+/g, " ");
+        chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");
+
+        // If we clicked the button with no selected text, we just
+        // make a level 2 hash header around some default text.
+        if (!chunk.selection) {
+            chunk.startTag = "## ";
+            chunk.selection = this.getString("headingexample");
+            chunk.endTag = " ##";
+            return;
+        }
+
+        var headerLevel = 0;     // The existing header level of the selected text.
+
+        // Remove any existing hash heading markdown and save the header level.
+        chunk.findTags(/#+[ ]*/, /[ ]*#+/);
+        if (/#+/.test(chunk.startTag)) {
+            headerLevel = re.lastMatch.length;
+        }
+        chunk.startTag = chunk.endTag = "";
+
+        // Try to get the current header level by looking for - and = in the line
+        // below the selection.
+        chunk.findTags(null, /\s?(-+|=+)/);
+        if (/=+/.test(chunk.endTag)) {
+            headerLevel = 1;
+        }
+        if (/-+/.test(chunk.endTag)) {
+            headerLevel = 2;
+        }
+
+        // Skip to the next line so we can create the header markdown.
+        chunk.startTag = chunk.endTag = "";
+        chunk.skipLines(1, 1);
+
+        // We make a level 2 header if there is no current header.
+        // If there is a header level, we substract one from the header level.
+        // If it's already a level 1 header, it's removed.
+        var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;
+
+        if (headerLevelToCreate > 0) {
+
+            // The button only creates level 1 and 2 underline headers.
+            // Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
+            var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
+            var len = chunk.selection.length;
+            if (len > SETTINGS.lineLength) {
+                len = SETTINGS.lineLength;
+            }
+            chunk.endTag = "\n";
+            while (len--) {
+                chunk.endTag += headerChar;
+            }
+        }
+    };
+
+    commandProto.doHorizontalRule = function (chunk, postProcessing) {
+        chunk.startTag = "----------\n";
+        chunk.selection = "";
+        chunk.skipLines(2, 1, true);
+    }
+
+
+})();
\ No newline at end of file
diff --git a/webgui/3rdparty/pagedown/Markdown.Sanitizer.js b/webgui/3rdparty/pagedown/Markdown.Sanitizer.js
new file mode 100644
index 000000000..73f5d7467
--- /dev/null
+++ b/webgui/3rdparty/pagedown/Markdown.Sanitizer.js
@@ -0,0 +1,108 @@
+(function () {
+    var output, Converter;
+    if (typeof exports === "object" && typeof require === "function") { // we're in a CommonJS (e.g. Node.js) module
+        output = exports;
+        Converter = require("./Markdown.Converter").Converter;
+    } else {
+        output = window.Markdown;
+        Converter = output.Converter;
+    }
+        
+    output.getSanitizingConverter = function () {
+        var converter = new Converter();
+        converter.hooks.chain("postConversion", sanitizeHtml);
+        converter.hooks.chain("postConversion", balanceTags);
+        return converter;
+    }
+
+    function sanitizeHtml(html) {
+        return html.replace(/<[^>]*>?/gi, sanitizeTag);
+    }
+
+    // (tags that can be opened/closed) | (tags that stand alone)
+    var basic_tag_whitelist = /^(<\/?(b|blockquote|code|del|dd|dl|dt|em|h1|h2|h3|i|kbd|li|ol(?: start="\d+")?|p|pre|s|sup|sub|strong|strike|ul)>|<(br|hr)\s?\/?>)$/i;
+    // <a href="url..." optional title>|</a>
+    var a_white = /^(<a\shref="((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)*[\]$]+"(\stitle="[^"<>]+")?\s?>|<\/a>)$/i;
+
+    // <img src="url..." optional width  optional height  optional alt  optional title
+    var img_white = /^(<img\ssrc="(https?:\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)*[\]$]+"(\swidth="\d{1,3}")?(\sheight="\d{1,3}")?(\salt="[^"<>]*")?(\stitle="[^"<>]*")?\s?\/?>)$/i;
+
+    function sanitizeTag(tag) {
+        if (tag.match(basic_tag_whitelist) || tag.match(a_white) || tag.match(img_white))
+            return tag;
+        else
+            return "";
+    }
+
+    /// <summary>
+    /// attempt to balance HTML tags in the html string
+    /// by removing any unmatched opening or closing tags
+    /// IMPORTANT: we *assume* HTML has *already* been 
+    /// sanitized and is safe/sane before balancing!
+    /// 
+    /// adapted from CODESNIPPET: A8591DBA-D1D3-11DE-947C-BA5556D89593
+    /// </summary>
+    function balanceTags(html) {
+
+        if (html == "")
+            return "";
+
+        var re = /<\/?\w+[^>]*(\s|$|>)/g;
+        // convert everything to lower case; this makes
+        // our case insensitive comparisons easier
+        var tags = html.toLowerCase().match(re);
+
+        // no HTML tags present? nothing to do; exit now
+        var tagcount = (tags || []).length;
+        if (tagcount == 0)
+            return html;
+
+        var tagname, tag;
+        var ignoredtags = "<p><img><br><li><hr>";
+        var match;
+        var tagpaired = [];
+        var tagremove = [];
+        var needsRemoval = false;
+
+        // loop through matched tags in forward order
+        for (var ctag = 0; ctag < tagcount; ctag++) {
+            tagname = tags[ctag].replace(/<\/?(\w+).*/, "$1");
+            // skip any already paired tags
+            // and skip tags in our ignore list; assume they're self-closed
+            if (tagpaired[ctag] || ignoredtags.search("<" + tagname + ">") > -1)
+                continue;
+
+            tag = tags[ctag];
+            match = -1;
+
+            if (!/^<\//.test(tag)) {
+                // this is an opening tag
+                // search forwards (next tags), look for closing tags
+                for (var ntag = ctag + 1; ntag < tagcount; ntag++) {
+                    if (!tagpaired[ntag] && tags[ntag] == "</" + tagname + ">") {
+                        match = ntag;
+                        break;
+                    }
+                }
+            }
+
+            if (match == -1)
+                needsRemoval = tagremove[ctag] = true; // mark for removal
+            else
+                tagpaired[match] = true; // mark paired
+        }
+
+        if (!needsRemoval)
+            return html;
+
+        // delete all orphaned tags from the string
+
+        var ctag = 0;
+        html = html.replace(re, function (match) {
+            var res = tagremove[ctag] ? "" : match;
+            ctag++;
+            return res;
+        });
+        return html;
+    }
+})();
diff --git a/webgui/main.js b/webgui/main.js
index b37a5f50f..36b5571f5 100644
--- a/webgui/main.js
+++ b/webgui/main.js
@@ -15,6 +15,7 @@ require.config({
         props : 'lib/props2',
         sammy: '3rdparty/sammy-latest.min',
         aircraft: '../aircraft-dir',
+        pagedown: '3rdparty/pagedown'
     }
 });
 
diff --git a/webgui/topics/Aircraft/Help.html b/webgui/topics/Aircraft/Help.html
index 828b17536..135a9c9e1 100644
--- a/webgui/topics/Aircraft/Help.html
+++ b/webgui/topics/Aircraft/Help.html
@@ -10,7 +10,7 @@
     <tbody data-bind="foreach: helpContent">
         <tr>
             <!--  ko if: $data.type == 'line' || $data.type == 'text' -->
-            <td colspan="2" data-bind="text: $data.text"></td>
+            <td colspan="2" data-bind="html: $data.text"></td>
             <!-- /ko -->
             <!--  ko if: $data.type == 'key' -->
             <td><span>Key</span><span data-bind="text: $data.name" style="padding: 0 1em 0 0.5em; font-weight: bold;"></span></td>
diff --git a/webgui/topics/Aircraft/Help.js b/webgui/topics/Aircraft/Help.js
index 2304e7cde..b446ca96e 100644
--- a/webgui/topics/Aircraft/Help.js
+++ b/webgui/topics/Aircraft/Help.js
@@ -1,6 +1,9 @@
 define([
-        'jquery', 'knockout', 'text!./Help.html'
+        'jquery', 'knockout', 'text!./Help.html', 'pagedown/Markdown.Converter'
 ], function(jquery, ko, htmlString) {
+
+    var converter = new Markdown.Converter();
+
     function ViewModel(params) {
         var self = this;
 
@@ -31,7 +34,7 @@ define([
                 } else if (prop.name == 'text') {
                     helpContent.push({
                         type: 'text',
-                        text: prop.value,
+                        text: converter.makeHtml(prop.value),
                     });
                 } else if (prop.name == 'key') {
                     var content = {