A simple reformatted/reusable Cookie helper from W3School.

Cookie Helper

var Cookie = {
    set: function (cookieName, cookieValue, expireDays) {
        var expireDate = new Date();
        expireDate.setDate(expireDate.getDate() + expireDays);
        var cookie = encodeURIComponent(cookieValue) + ((expireDays == null) ? "" : "; expires=" + expireDate.toUTCString());
        document.cookie = cookieName + "=" + cookie + ";path=/";
    },

    get: function (cookieName) {
        var cookieValue = document.cookie;
        var cookieStart = cookieValue.indexOf(" " + cookieName + "=");
        if (cookieStart == -1) {
            cookieStart = cookieValue.indexOf(cookieName + "=");
        }
        if (cookieStart == -1) {
            cookieValue = null;
        } else {
            cookieStart = cookieValue.indexOf("=", cookieStart) + 1;
            var cookieEnd = cookieValue.indexOf(";", cookieStart);
            if (cookieEnd == -1) {
                cookieEnd = cookieValue.length;
            }
            cookieValue = decodeURIComponent(cookieValue.substring(cookieStart, cookieEnd));
        }

        return cookieValue;
    },

    check: function (cookieName) {
        var value = Cookie.get(cookieName);

        return (value);
    },

    remove: function (cookieName) {
        document.cookie = cookieName + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT;path=/';
    }
};