// z.




function openPopup(url, breite, hoehe) {
  var x = screen.width / 2 - breite / 2;
  var y = screen.height / 2 - hoehe / 2;
  var attribs = "width=" + breite + ",height=" + hoehe + ",left=" + x + ",top=" + y + ",status=yes,resizable=yes,scrollbars=yes";

  var win = window.open(url, 'popup', attribs);
  win.focus();
}