// Create a cookie with the specified name and value.
function SetCookie(sName, sValue) {
    document.cookie = sName + "=" + escape(sValue);
    // Expires the cookie in one month
    var date = new Date();
    date.setMonth(date.getMonth() + 1);
    document.cookie += ("; expires=" + date.toUTCString());
}

// Retrieve the value of the cookie with the specified name.
function GetCookie(sName) {
    // cookies are separated by semicolons
    var aCookie = document.cookie.split("; ");
    for (var i = 0; i < aCookie.length; i++) {
        // a name/value pair (a crumb) is separated by an equal sign
        var aCrumb = aCookie[i].split("=");
        if (sName == aCrumb[0])
            return unescape(aCrumb[1]);
    }
    // a cookie with the requested name does not exist
    return null;
}