var e = 0;
    $.ajax({
        type: "GET",
        url: "engine?",
        async: true,
        dataType: "html",
        beforeSend: function() {
            czas = (new Date).getTime()
        },
        success: function(t) {
            var delay = (new Date).getTime() - czas;
            if (delay > 15000) {
                location.href = location.href;
                message("Odświeżam.")
            }
        },
        error: function() {
            location.href = location.href;
            message("Odświeżam.")
        }
    })