var mysrc = 'https://tracking.buygoods.com/track/?a=6174&firstcookie=0'
            + '&tracking_redirect=&referrer=' + encodeURIComponent(document.referrer)
            + '&sessid2=' + ReadCookie('sessid2') + '&product=prod7,prod8,prod9,prod11&caller_url=' + encodeURIComponent(window.location.href);

        if (typeof add_to_cart !== 'undefined') {
            mysrc = mysrc + '&add_to_cart=' + add_to_cart;
        }

        var newScript = document.createElement('script');
        newScript.type = 'text/javascript';
        newScript.defer = true;
        newScript.src = mysrc;
        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(newScript, s);

        function ReadCookie(name) {
            name += '=';
            var parts = document.cookie.split(/;s*/);
            for (var i = 0; i < parts.length; i++) {
                var part = parts[i];
                if (part.indexOf(name) == 0) {
                    return part.substring(name.length);
                }
            }
            return '';
        }