Index: branches/5.0.x/core/admin_templates/js/tab_scroller.js
===================================================================
diff -u -r12230 -r12232
--- branches/5.0.x/core/admin_templates/js/tab_scroller.js	(.../tab_scroller.js)	(revision 12230)
+++ branches/5.0.x/core/admin_templates/js/tab_scroller.js	(.../tab_scroller.js)	(revision 12232)
@@ -113,11 +113,11 @@
 
 	if ($start + this.viewPortWidth >= this.totalWidth) {
 		$next.addClass('disabled');
-		$next.parents('td:first').addClass('disabled');
+		$next.parents('td.scroll-right-container:first').addClass('disabled');
 	}
 	else {
 		$next.removeClass('disabled');
-		$next.parents('td:first').removeClass('disabled');
+		$next.parents('td.scroll-right-container:first').removeClass('disabled');
 	}
 }