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        var Request = null;
        if (window.XMLHttpRequest) { Request = new XMLHttpRequest(); }

        function Check() {
            Interval = setInterval(doCheck, 1000);
        }

        function doCheck() {
            if (!Request) { alert("Browser does not support Ajax!"); return; }
            Request.open("GET", "checksignal", true);
            Request.onreadystatechange = function () {
                if (Request.readyState == 4 && Request.status == 200) {
                    var Reply = JSON.parse(Request.responseText);
                    if (Reply) {
                        document.getElementById("RX").innerHTML = "RX level: <b>" + Reply.rx + "dBm</b>";
                        document.getElementById("TX").innerHTML = "TX level: <b>" + Reply.tx + "dBm</b>";
                    }
                }
            }
            Request.send();
        }

        function Cancel() {
            clearInterval(Interval);
        }