function closePopup()
{
	var modal = $find(modalPopupExtenderClientID);
	if (typeof (modal) != 'undefined' && modal != null)
	{
		modal.hide();
	}
}

function pageLoad(sender, args)
{
	$addHandler(document, "keydown", onKeyDown);
}

function onKeyDown(args)
{
	if (args.keyCode == Sys.UI.Key.esc)
	{
		closePopup();
	}
}