var win=1;
var mac=2;
var linux=3;

var nn=1;
var ie=2;
var opera=3;

var browservar=nn;
var versionvar=4;
var platformvar=win;

if (navigator.appName.indexOf('Netscape') != -1)
     {browservar=nn;}
else if
(navigator.appName.indexOf('Explorer') != -1)
     {
     browservar=ie;
     }
else if
 (navigator.userAgent.indexOf('Opera') != -1)
     {browservar=opera;}

versionvar = navigator.appVersion.substring(0,1);

if (navigator.platform.indexOf('Win') != -1)
     {platformvar=win;}

else if (navigator.platform.indexOf('Mac') != -1)
     {platformvar=mac;}

else if (  (navigator.platform.indexOf('Linux') != -1) || (navigator.platform.indexOf('X11') != -1)  )
     {platformvar=linux;}










var bName    = navigator.appName;
var bVer     = navigator.appVersion.indexOf("5.0");
var bMac     = navigator.userAgent.indexOf("Mac");
var bWin     = navigator.userAgent.indexOf("Win");
var bLinux   = navigator.userAgent.indexOf("Linux");
var bVersion

// Mac?
if (platformvar == mac)
     {
     // MSIE 4? Wird nur fuer Mac verwendet, bei Win und Linux egal.
     if (bName == "Microsoft Internet Explorer" && bVer == "-1") bVersion = "IE4";
     if (  (browservar=ie && versionvar==4)  ||  browservar == nn)
          {
          document.write('<link rel="stylesheet" type="text/css" href="css/mac.css">');
          }
     else
          {
          document.write('<link rel="stylesheet" type="text/css" href="css/mac.css">');
          }
     }

// css für win
if (platformvar==win)
     {
     document.write('<link rel="stylesheet" type="text/css" href="css/win.css">');
     }

// css für linuxe
if (platformvar==linux)
     {
     document.write('<link rel="stylesheet" type="text/css" href="css/linux.css">');
     }