Index: /CKEditor/trunk/_source/core/dom/node.js
===================================================================
--- /CKEditor/trunk/_source/core/dom/node.js	(revision 3369)
+++ /CKEditor/trunk/_source/core/dom/node.js	(revision 3370)
@@ -97,9 +97,21 @@
 			var $clone = this.$.cloneNode( includeChildren );
 
-			if ( this.type == CKEDITOR.NODE_ELEMENT && !cloneId )
-			{
+			if ( !cloneId )
+			{
+				var removeIds = function( node )
+				{
+					if ( node.nodeType != CKEDITOR.NODE_ELEMENT )
+						return;
+
+					node.removeAttribute( 'id', false ) ;
+					node.removeAttribute( '_cke_expando', false ) ;
+
+					var childs = node.childNodes;
+					for ( var i=0 ; i < childs.length ; i++ )
+						removeIds( childs[ i ] );
+				};
+
 				// The "id" attribute should never be cloned to avoid duplication.
-				$clone.removeAttribute( 'id', false ) ;
-				$clone.removeAttribute( '_cke_expando', false ) ;
+				removeIds( $clone );
 			}