Ticket #2771: core.js.patch

core.js

@@ -144 +144 @@
     index: function( elem ) {
         var ret = -1;
 
+        // if the elem argument is a jQuery object, get the element
+        if (elem instanceof jQuery) {
+            elem = elem.get(0);
+        }
+
         // Locate the position of the desired element
         this.each(function(i){
             if ( this == elem )