Subdomain redirection

$returnLang = $_SERVER['HTTP_X_GT_LANG'];
        if (!$returnLang)
            $returnBase = "http://www.foedies.com/";
        else
            $returnBase = "http://"  . $returnLang . ".foedies.com/";
        $doc->addCustomTag('<script type="text/javascript">' .
        $logoutFacebookJavascript . "\n" .
        "jfbc.base = '" . $returnBase . "';\n" .
        "jfbc.return_url = '" . base64_encode($return) . "';\n" .
        "jfbc.login.scope = '" . $requiredPerms . "';\n" .
        "jfbc.login.show_modal = '" . $showLoginModal . "';\n" .
        "jfbc.login.use_popup = " . ($this->configModel->get('login_use_popup') ? 'true' : 'false') . ";\n" .
        "jfbc.login.auto = '" . $this->configModel->get('facebook_auto_login') . "';\n" .
        "jfbc.login.logged_in = " . (!$user->guest && JFBCFactory::usermap()->getProviderUserId($user->id, 'facebook') ? 'true' : 'false') . ";\n" .
        "jfbc.token = '" . JSession::getFormToken() . "';\n" .
        $debugCmd .
        "jfbc.init();\n" .
        "</script>");