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

function beginReq(sender, args) {
    // shows the Popup
    postbackElement = args.get_postBackElement();
    //alert(postbackElement.id.toLowerCase());
    if(postbackElement.id != 'ctl00_ContentPlaceHolder1_MainGroups')
    $find(ModalProgress).show();
}

function endReq(sender, args) {
    //  shows the Popup
    if (postbackElement.id != 'ctl00_ContentPlaceHolder1_MainGroups')
	$find(ModalProgress).hide();
}

function initreq(sender, args) {
    
}