var NN 	= (navigator.appName == "Netscape");
var IE 	= (navigator.appName == "Microsoft Internet Explorer");
var MAC = (navigator.appVersion.indexOf("Mac") != -1);

  if (!NN && !IE){IE="1";}
  pfad="../../style_ie/";
  if (MAC)
  { if (IE)
      cstyle= mac_ie;
    else
      cstyle= mac_ns; 
  }
  else
  { if (IE)
      cstyle= pc_ie;
    else
      cstyle= pc_ns;
  } 

   document.write('<LINK REL=stylesheet TYPE="text/css" HREF="'+pfad+cstyle+'">');