jQuery(window).unload(function() {
    if (typeof (Newport) != "undefined" && typeof (Newport.application_root_url) != "undefined") {
        heavyImage = new Image();
        //alert(Newport.application_root_url + "jobs/cron.aspx?gif=1");
        heavyImage.src = Newport.application_root_url + "jobs/cron.aspx?gif=1";
    }
}
);