//  register for our events
Sys.Application.add_init(AppInit);
function AppInit(sender)
{   
    Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequest);  
    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);
}
            
function beginRequest(sender, args){
	// show the popup
	$find(ModalProgress).show();    

	
}

function endRequest(sender, args) {
	//  hide the popup
	$find(ModalProgress).hide();
		
	
}