Javascript are cookies enabled?

function are_cookies_enabled()
{
        var cookieEnabled = (navigator.cookieEnabled) ? true : false;

        if (typeof navigator.cookieEnabled == "undefined" && !cookieEnabled)
        {
                document.cookie="testcookie";
                cookieEnabled = (document.cookie.indexOf("testcookie") != -1) ? true : false;
        }
        return (cookieEnabled);
}