navigator.browserLanguage

Hi Everyone,

I'm dharyl from Philippines, I had a problem in knowing the user's browser Language. I was asked to have an alert pop up when the user of the site is using other language than "en-us".
I had this code below just to test what language setting should the page read from the user.
<script language="JavaScript">
var a = navigator.browserLanguage;
var b = navigator.userLanguage;
var c = navigator.systemLanguage;
alert("browser language");
alert(a);
alert("user language");
alert(b);
alert("system language");
alert(c);
</script>
navigator.browserLanguage --> en-us
navigator.systemLanguage --> en-us
navigator.userLanguage --> en-us

when I change my browser language from Tools>InternetOptions>General>Languages
results are the same:
navigator.browserLanguage --> en-us
navigator.systemLanguage --> en-us
navigator.userLanguage --> en-us

when I change my browser language from
Start>ControlPanel>RegionalandLanguageOptions>Regional Options tab
the value of userLanguage changes just as what I set:
navigator.browserLanguage --> en-us
navigator.systemLanguage --> en-us
navigator.userLanguage --> Ja


That means navigator.userLanguage is for this one
Start>ControlPanel>RegionalandLanguageOptions>Regional Options tab

Now my point is how would I get the value of language setting for this one?
Tools>InternetOptions>General>Languages


I guess what I really need to know is how to get/read/know the current value of browserLanguage of the user. That was really what I need.

Because I guess that's what I need for my task to be done.
Hope you guys can help me on this.


Thanks in advance,
dha