function handleFbConnected(isNew) {
    window.location = (isNew) ? '/signup/fbinvite.aspx' : '?fromFacebookLogin=1';
}

function logout(from) {
    var url = (from) ? "/logout.aspx?from=" + from : "/logout.aspx";

    FB.getLoginStatus(function(response) {
        if (response.session) {            
            FB.logout(function(response) {
                window.location = url;
            });
        } else {            
            window.location = url;
        }
    });
}