function writeCookie(name, value, days) {
    if (days == null || days == "") days = 365;
    var d = new Date();
    d.setTime(d.getTime() + (days * 24 * 60 * 60 * 1000));
    var expires = "; expires=" + d.toGMTString();
    document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
    var c = document.cookie;
    if (c.indexOf(name) != -1) {
        pos1 = c.indexOf("=", c.indexOf(name)) + 1;
        pos2 = c.indexOf(";", pos1);
        if (pos2 == -1) pos2 = c.length; ;
        data = c.substring(pos1, pos2);
        return data;
    }
}