function setCookie(cookieName, cookieValue, nDays) {
        var today = new Date();
        var expire = new Date();
        if (nDays == null || nDays == 0) nDays = 1;
        expire.setTime(today.getTime() + 3600000 * 24 * nDays);
        document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString() + ";path=/";
    }

    function getCookie(check_name) {
        var a_all_cookies = document.cookie.split(';');
        var a_temp_cookie = '';
        var cookie_name = '';
        var cookie_value = '';
        var b_cookie_found = false;
        for (i = 0; i < a_all_cookies.length; i++) {
            a_temp_cookie = a_all_cookies[i].split('=');
            cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');
            if (cookie_name == check_name) {
                b_cookie_found = true;
                if (a_temp_cookie.length > 1)
                    cookie_value = unescape(a_temp_cookie[1].replace(/^\s+|\s+$/g, ''));
                return cookie_value;
                break;
            }
            a_temp_cookie = null;
            cookie_name = '';
        }
        if (!b_cookie_found)
            return null;
    }

    function deleteCookie(name) {
        document.cookie = name + '=; expires=Thu, 01-Jan-70 00:00:01 GMT;';
    }