function getLangCookieValue() {
    var cookies = document.cookie.split(/\s*;\s/);
    for (var i = 0; i < cookies.length; i++){
        var cookieCrumbs = cookies[i].split("=");
        var cookieName = cookieCrumbs[0];
        var cookieValue = cookieCrumbs[1];
        if (cookieName == "CK_SDC_LANG"){
            return cookieValue;
        }
    }
    return false;
}

var lang = getLangCookieValue();
if (! lang) lang = "en";
var newUrl = location.protocol + "//" + location.hostname + "/home/index.page?lang=" +  lang;

window.location.href = newUrl;