function setCookie(sName, sValue, nDays) {
    var sExpires = "";
    if (nDays) {
        var dtDate = new Date();
        dtDate.setTime(dtDate.getTime() + (nDays * 24 * 60 * 60 * 1000));
        sExpires = "; expires=" + dtDate.toGMTString();
    }
    document.cookie = sName + "=" + escape(sValue) + sExpires + "; path=/";
}

function getCookie(sName) {
    var sRtn;
    var sNameStr = sName + "=";
    var aryKeyValue = document.cookie.split(';');
    for (var i = 0; i < aryKeyValue.length; i++) {
        var sKey = aryKeyValue[i];
        while (sKey.charAt(0) == ' ') sKey = sKey.substring(1, sKey.length);
        if (0 == sKey.indexOf(sNameStr)) { sRtn = sKey.substring(sNameStr.length, sKey.length); break; }
    }
    return sRtn?unescape(sRtn):sRtn;
}

function delCookie(sName) {
    setCookie(sName, "", -1);
}