Cookie inJavaScript

cookie.js

var cookie = {
    getCookie: function(name) {
        var value = document.cookie.match(new RegExp("(?:^|; )" + name + "=([^;]*)"));
        return value ? decodeURIComponent(value[1]) : null;
    },

    setCookie: function (name, value, duration, path) {
        var cookie = [];
        cookie.push(name + "=" + encodeURIComponent(value));
        if (duration) {
            var date = new Date();
            date.setSeconds(date.getSeconds() + duration);
            cookie.push("Expires=" + date.toUTCString());
        }
        if (!path) {
            path = "/";
        }
        cookie.push("Path=" + path);
        document.cookie = cookie.join("; ");
    }
}