function FensterOeffnen (Vertretung) {
  Fenster = window.open(Vertretung, "Vertretung", "width=450,height=400,left=100,top=100, scrollbars=yes, resizable=yes");
  Fenster.focus();
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}