function setCookie(CookieName, CookieString, Expires ,timeUnit)
{
    if ((CookieName != null) && (CookieString != null))
    {
        if (Expires == null)
//            document.cookie = CookieName + "=" + escape(CookieString)
// 為了節省 cookie 使用空間 不使用 escape
            document.cookie = CookieName + "=" + CookieString
        else
        {
            Expires = eval(Expires);
            setDay = new Date();

            if (timeUnit == null)
                timeUnit = "day";

            switch (timeUnit)
            {
                case "week":
                    setDay.setTime(setDay.getTime()+(Expires*1000*60*60*24*7));
                    break;
                case "day":
                    setDay.setTime(setDay.getTime()+(Expires*1000*60*60*24));
                    break;
                case "hour":
                    setDay.setTime(setDay.getTime()+(Expires*1000*60*60));
                    break;
                case "minute":
                    setDay.setTime(setDay.getTime()+(Expires*1000*60));
                    break;
                case "second":
                    setDay.setTime(setDay.getTime()+(Expires*1000));
                    break;
                default:
                    setDay.setTime(setDay.getTime()+(Expires*1000*60*60*24));
            }

            expTime = setDay.toGMTString();
            document.cookie = CookieName + "=" + escape(CookieString) + ";expires=" + expTime ;
        }

        return true;
    }
    return false;
}

function getCookie(CookieName)
{
    CookieName += "=";
    theCookie = document.cookie+";";
    start = theCookie.indexOf(CookieName);

    if (start != -1)
    {
        End = theCookie.indexOf(";",start);
        return unescape(theCookie.substring(start+CookieName.length,End));
    }
}

function deleteCookie(CookieName)
{
    document.cookie = CookieName + "=;expires=Thu,01-Jan-70 00:00:01 GMT";
}