function popup_w(url, w, h) {
    var centerWidth = (window.screen.width - w) / 2;
    var centerHeight = (window.screen.height - h) / 2;
    newWindow = window.open(url,"","width=" + w + ",height=" + h + ",toolbar=no,menubar=no,scrollbars=no,status=no,location=no");
    newWindow.moveTo(centerWidth, centerHeight);
    newWindow.blur();
    newWindow.focus();
}