$(document).ajaxStart(aipBlockUI).ajaxStop($.unblockUI);

function aipBlockUI(){
	$.blockUI({ message: '<h1><img src="/AIPNIOPDCSIB/images/icons/loading.gif" /> لطفا کمی صبر کنید...</h1>' ,width:600});
}
function aipUnBlockUI(){
	$.unblockUI();
}