Well well. We have a functional editor. Now some CSS.

scratch/js/gollum-editor/gollum.editor.js

@@ -474,7 +474,8 @@
      createMarkup: function( title, body ) {
        Dialog.markupCreated = true;
        return  '<div id="gollum-editor-dialog">' +
-               '<div id="gollum-editor-dialog-title"><h4>' + title + '</h4></div>' +
+               '<div id="gollum-editor-dialog-title"><h4>' + 
+                 title +'</h4></div>' +
                '<div id="gollum-editor-dialog-body">' + body + '</div>' + 
                '<div id="gollum-editor-dialog-buttons">' + 
                '<a href="#" title="OK" id="gollum-editor-action-ok">OK</a>' +

scratch/js/gollum-editor/langs/markdown.js

@@ -56,6 +56,21 @@ var MarkDown = {
                               replace: "> $1$2"
                             }, 
                             
+  'function-h1'         :   {
+                              search: /(.+)([\n]?)/gi,
+                              replace: "# $1$2"
+                            },
+                            
+  'function-h2'         :   {
+                              search: /(.+)([\n]?)/gi,
+                              replace: "## $1$2"
+                            },
+                            
+  'function-h3'         :   {
+                              search: /(.+)([\n]?)/gi,
+                              replace: "### $1$2"
+                            },
+                            
   'function-link'       :   {
                               exec: function( txt, selText, $field ) {
                                 var results = null;