function Emulator(id)
{
	this.object_id = id;
	this.velocity = document.getElementById("velocity"+this.object_id).value;
	this.track = document.getElementById("track"+this.object_id).value;

	this.xmlHttp = createXmlHttpRequestObject();
  
  this.loadObjects = function()
	{
		if (this.xmlHttp && (this.xmlHttp.readyState == 4 || this.xmlHttp.readyState == 0))
    {
      var query = "emulation.php?track="+this.track+"&object_id="+this.object_id+"&velocity="+this.velocity;
  		this.xmlHttp.open("GET", query, true);
  		this.xmlHttp.onreadystatechange = this.handleLoadObjects;
  		this.xmlHttp.send(null);
    }
	}
	
	this.handleLoadObjects = function()
	{
    if (this.xmlHttp.readyState == 4 && this.xmlHttp.status == 200)
    {
      alert("ok");
    }
  }
}

var em = new Emulator(1);
  em.loadObjects();

var self = this;

var t = this;
this.handleLoadObjects = function() {
    if (t.xmlHttp.readyState == 4 && t.xmlHttp.status == 200)  {
      alert("ok");
    }
}

var myFunc = 't.loadObjects("'+object_id+'", "'+velocity+'", "'+track+'")';
setTimeout(myFunc, 3000);

setTimeout(function() { self.loadObjects(); }, 10);