Index: _source/core/editor.js
===================================================================
--- _source/core/editor.js	(revision 5949)
+++ _source/core/editor.js	(working copy)
@@ -383,6 +383,13 @@
 				throw '[CKEDITOR.editor] The instance "' + this.name + '" already exists.';
 
 			/**
+			 * A unique random string assigned to each editor instance in the page.
+			 * @name CKEDITOR.editor.prototype.id
+			 * @type String
+			 */
+			this.id = CKEDITOR.tools.getNextId();
+
+			/**
 			 * The configurations for this editor instance. It inherits all
 			 * settings defined in (@link CKEDITOR.config}, combined with settings
 			 * loaded from custom configuration files and those defined inline in
Index: _source/skins/kama/skin.js
===================================================================
--- _source/skins/kama/skin.js	(revision 5949)
+++ _source/skins/kama/skin.js	(working copy)
@@ -147,7 +147,7 @@
 				{
 					var cssContent,
 						uiStyle = getStylesheet( CKEDITOR.document ),
-						cssId = '.cke_editor_' + CKEDITOR.tools.escapeCssSelector( editor.name );
+						cssId = '.' + editor.id;
 
 					var cssSelectors =
 						[
Index: _source/themes/default/theme.js
===================================================================
--- _source/themes/default/theme.js	(revision 5949)
+++ _source/themes/default/theme.js	(working copy)
@@ -22,7 +22,7 @@
 			// Creates an HTML structure that reproduces the editor class hierarchy.
 			var html =
 				'<span class="cke_shared">' +
-				'<span class="' + editor.skinClass + ' cke_editor_' + editor.name + '">' +
+				'<span class="' + editor.skinClass + ' ' + editor.id + ' cke_editor_' + editor.name + '">' +
 				'<span class="' + CKEDITOR.env.cssClass + '">' +
 				'<span class="cke_wrapper cke_' + editor.lang.dir + '">' +
 				'<span class="cke_editor">' +
@@ -114,7 +114,7 @@
 				'<span' +
 					' id="cke_', name, '"' +
 					' onmousedown="return false;"' +
-					' class="', editor.skinClass, ' cke_editor_', name, '"' +
+					' class="', editor.skinClass, ' ', editor.id, ' cke_editor_', name, '"' +
 					' dir="', editor.lang.dir, '"' +
 					' title="', ( CKEDITOR.env.gecko ? ' ' : '' ), '"' +
 					' lang="', editor.langCode, '"' +
@@ -167,7 +167,7 @@
 			var baseIdNumber = CKEDITOR.tools.getNextNumber();
 
 			var element = CKEDITOR.dom.element.createFromHtml( [
-					'<div class="cke_editor_' + editor.name.replace('.', '\\.') + '_dialog cke_skin_', editor.skinName,
+					'<div class="', editor.id, '_dialog cke_editor_', editor.name.replace('.', '\\.'), '_dialog cke_skin_', editor.skinName,
 						'" dir="', editor.lang.dir, '"' +
 						' lang="', editor.langCode, '"' +
 						' role="dialog"' +