function karten_0()
  {
  if(navigator.appName == "Microsoft Internet Explorer")
    window.open("karten1_0.htm","Seekarten","menubar=yes,left=0,top=0,height=570,width=700,resizable=yes");
  if(navigator.appName == "Netscape")
    window.open("karten2_0.htm","Seekarten","menubar=yes,left=0,top=0,height=570,width=700,resizable=yes");
  }