// internal function
function getCookieVal (offset) 
{
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1)
    {
        endstr = document.cookie.length;
    }
    return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) 
{
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) 
    {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg)
        {
            return getCookieVal (j);
        }
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) 
        {
            break;
        }
    }
    return null;
}

function SetCookie (name, value) 
{
    var argv = SetCookie.arguments;
    var argc = SetCookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    var path = (argc > 3) ? argv[3] : null;
    var domain = (argc > 4) ? argv[4] : null;
    var secure = (argc > 5) ? argv[5] : false;
    document.cookie = name + "=" + escape (value) +
        ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
        ((path == null) ? "" : ("; path=" + path)) +
        ((domain == null) ? "" : ("; domain=" + domain)) +
        ((secure == true) ? "; secure" : "");
}

function DeleteCookie (name) 
{
    var exp = new Date();
    exp.setTime (exp.getTime() - 1);
    // This cookie is history
    var cval = GetCookie (name);
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}