function winOpen(url, breite, hoehe) {
      
      links = (screen.width/2)-(breite/2);
      oben = (screen.height/2)-(hoehe/2);
      window.open(url,"popup","height="+hoehe+",width="+breite+",status=no,toolbar=no,menubar=no,location=no,resizable=no,titlebar=no,scrollbars=no,fullscreen=no,top="+oben+",left="+links);
   }