How to handle an ActiveX event in Javascript

function MyControl::ReceiveMessage(msg)
{
   alert(msg);
}

var GetControl = document.getElementById("MyControl");
function GetControl::ReceiveMessage(msg)
{
   alert(msg);
}

<script for="MyControl" event="ReceiveMessage(msg)">
    alert(msg);
</script>

var clock = new ActiveXObject("Clocks.clock");
  var extendedClockEvents = clock.ExtendedClockEvents();
  // Here you assign (subscribe to) your callback method!
  extendedClockEvents.ScriptCallbackObject = clock_Callback;
  ...
  function clock_Callback(time)
  {
    document.getElementById("text_tag").innerHTML = time;
  }

function onEventHandler(arg1, arg2){
    // do something
}

window.onload = function(){
    var yourActiveXObject = document.getElementById('YourObjectTagID');
    if(typeof(yourActiveXObject) === 'undefined' || yourActiveXObject === null){
        alert('Unable to load ActiveX');
        return;
    }

    // attach events
    var status = yourActiveXObject.attachEvent('EventName', onEventHandler);
}

function MyControl::ReceiveMessage(msg)
{
   alert(msg);
}