function refreshJSON(url) {

        $.getJSON(url, function (data) {
            temps = [];
            var html = "";
            var el = document.getElementById("jsonTable");
            $.each(data.weather, function (key, val) {

                // val.value NEBO val.datetime
                temps.push(val.value);  // Ukladam teplotu do pole
            });
            el.innerHTML = html;
            min = Math.min.apply(null, temps);
            max = Math.max.apply(null, temps);
            $("#jsonTable").animate({ width: "40%" }, "slow");


            drawGauge(min,max);
        });
    }