var environment ='';

if (navigator.platform.indexOf("Win") > -1) {
environment = "pc";
} else if (navigator.platform.indexOf("Mac") > -1) {
environment = "mac";
}

var ua = navigator.userAgent.toLowerCase()
var netscapebrowser = (ua.indexOf("mozilla")!=-1 && ua.indexOf("compatible")==-1 && ua.indexOf("opera")==-1)
var iebrowser = (ua.indexOf("msie")>-1)
var av = navigator.appVersion
var version = av.substring(0, av.indexOf(" ")) *1
var version2 = av.substring(0, av.indexOf(".")) *1
if (netscapebrowser)
   var versionsnummer = version2
else if (iebrowser){
   if (version2<4)
      versionsnummer=3
   if (version2==4 && ua.indexOf("msie 5")==-1)
      versionsnummer = 4
   if (version2==4 && ua.indexOf("msie 5")>-1)
      versionsnummer = 5
   if (version2==4 && ua.indexOf("msie 6")>-1)
      versionsnummer = 6    
}

// Zuweisung der Stylesheets

if (netscapebrowser&&versionsnummer==2)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_nn2_' + environment + '.css" />');

if (netscapebrowser&&versionsnummer==3)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_nn3_' + environment + '.css" />');

if (netscapebrowser&&versionsnummer==4)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_nn4_' + environment + '.css" />');
   
if (netscapebrowser&&versionsnummer==5)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_nn6_' + environment + '.css" />');   

if (iebrowser&&versionsnummer==3)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_ie3_' + environment + '.css" />');

if (iebrowser&&versionsnummer==4)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_ie4_' + environment + '.css" />');
   
if (iebrowser&&versionsnummer==5)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_ie5_' + environment + '.css" />');
   
if (iebrowser&&versionsnummer==6)
   document.write('<link rel="stylesheet" type="text/css" href="../css/styles_ie6_' + environment + '.css" />');