agent = navigator.userAgent.toLowerCase();

        app = navigator.appName.toLowerCase();



        function isNavigatorOk() {

            if (agent.indexOf("msie 5") != -1 && agent.indexOf("mac_powerpc") != -1) return false;

            if (agent.indexOf("firefox") != -1) return true;

            if (agent.indexOf("safari") != -1) return true;

            if (agent.indexOf("msie") != -1) return true;

            if (agent.indexOf("mozilla/5.0") != -1) return true;

            return false;

        }