JavaScript AJAX wrapper

This is a simple code that wraps the XmlHttp Request and Response.

	/* Jscript */
	function AjaxWrapper()
	{
	var object = this;
	object.Request = NewRequest();
	object.Request.onreadystatechange = CompleteRequest;
	this.Sync = true;
	this.Method = "GET";
	this.URL = "";
	this.WebServiceMethod = "";
	this.Parameters = new ParameterCollection();
	this.Execute = ExecuteRequest;
	this.AsyncCallbackMethod = null;
	this.ResultXML = null;
	this.ResultText = null;
	function NewRequest()
	{
	if (window.XMLHttpRequest)
	return new XMLHttpRequest();
	else
	return new ActiveXObject("Microsoft.XMLHTTP");
	}
	function ExecuteRequest()
	{
	var parameters = object.Parameters.toString();
	ResetRequest();
	if (this.Method.toUpperCase() == "POST")
	{
	if (object.WebServiceMethod.length > 0)
	object.Request.open(object.Method, object.URL + "/" + object.WebServiceMethod, !object.Sync);
	else
	object.Request.open(object.Method, object.URL, !object.Sync);
	object.Request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	object.Request.send(object.Parameters);
	}
	else if (this.Method.toUpperCase() == "GET")
	{
	if (object.WebServiceMethod.length > 0 && parameters.length > 0)
	object.Request.open(object.Method, object.URL + "/" + object.WebServiceMethod + "?" + parameters, !object.Sync);
	else if (object.WebServiceMethod.length > 0)
	object.Request.open(object.Method, object.URL + "/" + object.WebServiceMethod, !object.Sync);
	else if (parametres.length > 0)
	object.Request.open(object.Method, object.URL + "?" + parameters, !object.Sync);
	else
	object.Request.open(object.Method, object.URL, !object.Sync);
	object.Request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	object.Request.send();
	}
	else
	{
	throw "The method '" + this.Method.toUpperCase() + "' is not supported !";
	}
	if (object.Sync)
	FinishRequest(object.Request.responseText);
	}
	function CompleteRequest()
	{
	if (object.Request.readyState == 4)
	{
	if (object.Request.status == 200)
	{
	FinishRequest(object.Request.responseText);
	if (object.AsyncCallbackMethod != null)
	object.AsyncCallbackMethod();
	}
	}
	}
	function ResetRequest()
	{
	object.Request = NewRequest();
	object.Request.onreadystatechange = CompleteRequest;
	}
	function FinishRequest(retourTexte)
	{
	var xmlDoc = new ActiveXObject("MSXML2.DOMDocument");
	object.ResultText = object.Request.responseText;
	try
	{
	xmlDoc.loadXML(object.Request.responseText);
	if (xmlDoc.parsed && xmlDoc.xml.length > 0)
	object.ResultXML = xmlDoc;
	else
	object.ResultXML = null;
	}
	catch (ex)
	{
	object.ResultXML = null;
	}
	}
	}

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