function ping() {
    var callback = function(response) {
        alert(response);
    }
    server.ping(callback);
}

function changeTour(control) {
    var callback = function(objWebDetails) {
        if (objWebDetails.strAvailability) {
            document.getElementById("contentAvailabilityMessage").innerHTML = objWebDetails.strAvailability;
            document.getElementById("rowAvailabilityMessage").style.display = "table-row";
        } else {
            document.getElementById("contentAvailabilityMessage").innerHTML = "";
            document.getElementById("rowAvailabilityMessage").style.display = "none";
        }
    }
    server.getWebDetails(control.options[control.selectedIndex].value, callback);
}