function winOpen(url,name, breite, hoehe) {
      // Errechnet Koordinaten, um das Popup zentriert zu platzieren
      links = (screen.width/2)-(breite/2);
      oben = (screen.height/2)-(hoehe/2);

      window.open(url,name,"height="+hoehe+",width="+breite+",status = no,toolbar = no,menubar = no,location = no,resizable = yes,titlebar = no,scrollbars = yes,fullscreen = no,top ="+oben+",left ="+links);
                 }