1)Add this code in the page out side the update panel :

2)call the load() mathood in the on the page load ,if page is content page then call it in Document.Ready() function of the Juery. 


 <script type="text/javascript" language="javascript">
        function load() {
            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
        }
        function EndRequestHandler()
        { debugger;
          // alert('You record has been saved successfully');
//          formatGridHeight('ngwAuditDownload', <%= ngwAuditDownload.Height %>);        }
    </script>

javascript execution for events  in update panel

javascript, update

JavaScript