if (navigator.appName == 'Netscape') { 
   var lang = navigator.language;
   }
else {
   var lang = navigator.browserLanguage;
   }
var lang = lang.substring(0,2);
if (!(lang == 'de' || lang == 'nl')) { 
   lang = 'en'; 
   }
window.location = './' + lang + '/index.htm';