cookies.js

        var api = {};
        api.Cookie = {
                create: function (name, value, days) {
                        var expires = "",
                                date;

                        if (days) {
                                date = new Date();
                                date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
                                expires = "; expires=" + date.toGMTString();
                        }

                        document.cookie = name + "=" + value + expires + "; path=/";
                },
                read: function (name) {
                        var nameEQ = name + "=",
                                ca = document.cookie.split(';'),
                                c = null,
                                i;

                        for (i = 0; i < ca.length; i++) {
                                c = ca[i];
                                while (c.charAt(0)==' ') {
                                        c = c.substring(1, c.length);
                                }
                                if (c.indexOf(nameEQ) == 0) {
                                        return c.substring(nameEQ.length, c.length);
                                }
                        }
                        return null;
                },
                erase: function (name) {
                        api.cookie.create(name, "", -1);
                }
        };