function FB_Logout(url, receiverFile, apiKey) {
    try {
        FB.init(apiKey, receiverFile);
        FB.ensureInit(function () {
            FB.Connect.logout(function () {
                document.cookie = apiKey + '_session_key=;expires=Thu, 01-Jan-1970 00:00:01 GMT';
                document.location = url;
            });

        });
    }
    catch (err) {
    }
}