Index: trunk/core/admin_templates/js/ajax.js
===================================================================
diff -u -N -r7635 -r8174
--- trunk/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 7635)
+++ trunk/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 8174)
@@ -115,7 +115,8 @@
 }
 
 Request.setOpacity = function (opacity, id) {
-    var object = document.getElementById(id).style;
+		var elem = typeof(id)=='string' ? document.getElementById(id) : id;
+    var object = elem.style;
     object.opacity = (opacity / 100);
     object.MozOpacity = (opacity / 100);
     object.KhtmlOpacity = (opacity / 100);