How do I create a redirect depending on the browser language?

A simple script that performs a redirect based on the set language of the browser used.

<script type="text/javascript">
var langcodes=new Array("en", "de", "default")

var langredirects=new Array("/englischeseite.html", "/deutscheseite.html","/englischeseite.htmln")

var languageinfo=navigator.language? navigator.language : navigator.userLanguage
var gotodefault=1

function redirectpage(dest){
if (window.location.replace)
   window.location.replace(dest)
else
   window.location=dest
}

for (i=0;i<langcodes.length-1;i++){
if (languageinfo.substr(0,2)==langcodes[i]){
   redirectpage(langredirects[i])
   gotodefault=0
break
}
}

if (gotodefault)
   redirectpage(langredirects[langcodes.length-1])
</script>