You don’t need jQuery for that, you can use vanilla Javascript:
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);
}