// JScript File
      function cancelEvent(e) {
                  //var test = AjaxControlToolkit.DropDownBehavior.get_isOpen();
                 
                   //src.onclick();
                   if(window.event) {
                      if (!e) e = window.event;
                      e.cancelBubble = true;
                  }
                  else if ( e.stopPropagation) {
                     //  alert('2');
                      e.stopPropagation();
                  }
                  else {
                       alert('3');
                      return false;
                    }
      }