Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginReq);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endReq);

function beginReq(sender, args) {
	// shows the Popup
	var elem = args.get_postBackElement();
	//alert(elem.id); ctl00_CPHolderLive_Timer1 
	if ("ctl00_Timer1" != elem.id && "Timer1" != elem.id )
	{	
	    $find(ModalProgress).show();
	}
}

function endReq(sender, args) {
	//  shows the Popup 
	$find(ModalProgress).hide();
}