// JScript File

var mgr = Sys.WebForms.PageRequestManager.getInstance();    
mgr.add_beginRequest(BeforeAjaxRequest);
mgr.add_endRequest(AfterAjaxRequest);
var scrollTop;

function BeforeAjaxRequest(sender, args) 
{
    mgr._scrollPosition = null;
}


 //This event is called after each request
 function AfterAjaxRequest(sender,args)
 {
    if (args.get_error())
    {
        args.set_errorHandled(true);           
    }
 }