Javascript redirection according to browser language [duplicate]

Question

I'm trying to send visitors that have browser language in English to an alternative site. I was able to find this code but it's not working:

<script type="type/javascript">

var language = navigator.browserLanguage;

// alert(language);

if (language.indexOf('en') > -1) {
document.location.href = 'http://en.socialpos.com.ar';
} else {
document.location.href = 'http://socialpos.com.ar';
}
</script>

I'm not even getting the alert :/
You can see it in http://socialpos.com.ar

Answer 1

var language = navigator.browserLanguage;

should be

var language = navigator.language || navigator.browserLanguage; //for IE

see my console results:

var language = navigator.browserLanguage;
undefined
language;
undefined
var language = navigator.language;
undefined
language;
"en-US"

Also please note that this was the first result for a google search: "javascript browser language". Google is your friend, and your google-fu is weak. Train it with searches!