<script>
    var bLocale = 'raw'; // can be used at any other place
    function processHeaders(headers) {
        bLocale = headers['Accept-Language'];
        comma = headers.indexOf(',');
        if (comma > 0) bLocale = bLocale.substring(0, comma);
    }
</script>
<script type="application/javascript" src="http://ajaxhttpheaders.appspot.com?callback=processHeaders"></script>