Index: branches/RC/core/admin_templates/js/grid_scroller.js
===================================================================
diff -u -N -r11599 -r11932
--- branches/RC/core/admin_templates/js/grid_scroller.js	(.../grid_scroller.js)	(revision 11599)
+++ branches/RC/core/admin_templates/js/grid_scroller.js	(.../grid_scroller.js)	(revision 11932)
@@ -28,7 +28,7 @@
 			var value = sheetRules[ii].selectorText;
 			if (value.match(',')) { // Mozilla does not break comma-separated selectors into separate rules...
 				var subselectors = value.split(',');
-				for (var sub in subselectors) {
+				for (var sub = 0; sub < subselectors.length; sub++) {
 					var real_name = subselectors[sub].replace(/^[ \t]*(.*)[ \t]*/, '$1');
 					this.Map[real_name] = sheetRules[ii]
 				}