var oeffnerFenster = "";
  var inhaltFenster = "";

  function Popup(vBreite, vHoehe, vURL, vName) {
    breite = screen.availWidth - 10;
    hoehe = screen.availHeight - 30;
    px = (breite/2)-(vBreite/2);
    py = (hoehe/2)-(vHoehe/2);
    fensterProps = "top="+py+",left="+px+",width="+vBreite+",height="+vHoehe+",dependant=yes,scrollbars=no,status=no,resizable=no";
    inhaltFenster = window.open(vURL,vName,fensterProps);
  }