ASP.NET - UpdatePanel and JavaScript

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandler);

function endRequestHandler(sender, args)
{
  // Do stuff
}

<script type="text/javascript">
            var prm = Sys.WebForms.PageRequestManager.getInstance();
            prm.add_beginRequest(BeginRequestHandler);
            prm.add_endRequest(EndRequestHandler);

            function BeginRequestHandler(sender, args)
            {
                 //Jquery Call
            }

            function EndRequestHandler(sender, args)
            {
                 //Jquery Call

            }
        </script>

setTimeout('$('#myMessage').fadeOut("slow")', 4000);

var requestManager = Sys.WebForms.PageRequestManager.getInstance();
requestManager.add_beginRequest(function () { alert('here1') });
requestManager.add_endRequest(function () { alert(here2') });