mp.cookie = {};

mp.cookie.set = function(name, value, expiredays) {
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = name + "=" + escape(value) +
    ((expiredays===null) ? "" : ";expires=" + exdate.toGMTString()) + 
    "; path=/";
};

mp.cookie.get = function(name) {
    if (document.cookie.length>0) {
        var start = document.cookie.indexOf(name + "=");
        if (start != -1) {
            start = start + name.length + 1;
            var end = document.cookie.indexOf(";", start);
            if (end == -1) { end=document.cookie.length; }
            return unescape(document.cookie.substring(start,end));
        }
    }
    return "";
};

mp.cookie.exists = function(name) {
    if (document.cookie.length > 0) {
        var start = document.cookie.indexOf(name + "=");
        if (start != -1) {
            return true;
        }
    }
    return false;
};