function FensterOeffnen(Datei)
{
   if (window.name != "textwindow") {
     window.open(Datei, "FensterPopup", "dependent=yes,locationbar=no,menubar=0,resizable=yes,status=no,width=500,height=400,screenX=30,screenY=30,scrollbars=yes");
   } else {
     location.href=Datei;
   }
}