// =====================
// Add a handler to Ajax EndRequest to call code on ajax page reload   
// =====================
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
function EndRequestHandler(sender, args)
{
    if ($('.hidMessage')[0].value != '')
   { 
        SetAlertMsg($('.hidMessage')[0].value);
        $('.hidMessage')[0].value = '';
    }
 }