function openCenteredWindowNoScroll(url, height, width) {
    var left = Math.floor((screen.width - width) / 2);
    var top = Math.floor((screen.height - height) / 2);
    var winParms = "top=" + top + ",left=" + left + ",height=" + height + ",width=" + width;
    winParms += "," + "titlebar=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,alwaysRaised=yes,AlwaysOnTop=yes";
    popupWindow = window.open(url, "", winParms);
}