var prm = Sys.WebForms.PageRequestManager.getInstance();

             
        if (prm) 
        {     
            prm.add_beginRequest(beginRequest);
            prm.add_endRequest(endRequest);
        }

        function beginRequest()
        {              
            var progressLabel = document.getElementById('lblProgress');
            progressLabel.style.visibility='visible';
            prm._scrollPosition = null;     
            document.body.style.cursor = 'wait';    
        }

        function endRequest() 
        {
            document.body.style.cursor = 'auto';
        }