function FactoryXMLHttpRequest() {
if(window.XMLHttpRequest) {
	return new XMLHttpRequest();
}
else if(window.ActiveXObject) {
	var msxmls = new Array(
	'Msxml2.XMLHTTP.5.0',
	'Msxml2.XMLHTTP.4.0',
	'Msxml2.XMLHTTP.3.0',
	'Msxml2.XMLHTTP',
	'Microsoft.XMLHTTP');
	for (var i = 0; i < msxmls.length; i++) {
	try {
		return new ActiveXObject(msxmls[i]);
		} catch (e) {
			}
	    }
}
	throw new Error("Could not instantiate XMLHttpRequest");
}

function Asynchronous( ) {
	this._xmlhttp = new FactoryXMLHttpRequest();
}

 function Asynchronous_call(url) {
	var instance = this;
	this._xmlhttp.open('GET', url, true);
	this._xmlhttp.onreadystatechange = function() {
		switch(instance._xmlhttp.readyState) {
				case 1:
					instance.loading();
					break;
				case 2:
					instance.loaded();
					break;
				case 3:
					instance.interactive();
					break;
				case 4:
					instance.complete(instance._xmlhttp.status,
								  instance._xmlhttp.statusText,
								  instance._xmlhttp.responseText, 
					              instance._xmlhttp.responseXML);
					break;
		}
	}
    this._xmlhttp.send(null);
}


function Asynchronous_loading() {
}

function Asynchronous_loaded() {
}

function Asynchronous_interactive() {
}

function Asynchronous_complete(status, statusText, responseText, responseHTML) {
}

Asynchronous.prototype.loading = Asynchronous_loading;
Asynchronous.prototype.loaded = Asynchronous_loaded;
Asynchronous.prototype.interactive = Asynchronous_interactive;
Asynchronous.prototype.complete = Asynchronous_complete;
Asynchronous.prototype.call = Asynchronous_call;