[JavaScript] Cookie z datą wygaśnięcia Opcje

[infoo1]

Kod

                create_cookie    :    function(name,value,days)
                {
                    days    =    9999999999;
                    if (days)
                    {
                        var date = new Date();
                        date.setTime(date.getTime()+(days*24*60*60*1000));
                        var expires = "; expires="+date.toGMTString();
                    }
                    else
                    {
                        var expires = "";
                    }
                    document.cookie = name+"="+value+expires+"; path=/";
                },

Co zrobić, aby to tworzyło cookie, które wygasa za te 9999999999 dni? Teraz jest "Expires: At End Of Session".