// Heinle's function for retrieving a cookie.
function getCookie(name)
{
    var cname = name + "=";
    var dc = document.cookie;

    if(dc.length > 0)
    {
        begin = dc.indexOf(cname);
        if(begin != -1)
        {
            begin += cname.length;
            end = dc.indexOf(";", begin);
            if(end == -1) end = dc.length;
            return unescape(dc.substring(begin, end));
        }
    }
    return null;
}

// An adaptation of Dorcht's function for setting a cookie.
function setCookie(name, value, expires, path, domain, secure)
{
    document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : "; expires=" + expires.toGMTString()) + ((path == null) ? "" : "; path=" + path) + ((domain == null) ? "" : "; domain=" + domain) + ((secure == null) ? "" : "; secure");
}

// An adaptation of Dorcht's function for deleting a cookie.
function delCookie(name, path, domain)
{
    if(getCookie(name))
    {
        document.cookie = name + "=" + ((path == null) ? "" : "; path=" + path) + ((domain == null) ? "" : "; domain=" + domain) + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}