// Define object
var net=new Object();

// XMLHttpRequest states
net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;


net.ContentLoader = function(observer, url, method, params, contentType)
{
	this.observer = observer;
	this.url = url;
	this.method = method;
	this.params = params;
	this.contentType = contentType;
}

net.ContentLoader.prototype.createRequest = function()
{
	var r = null;

	// Non-Microsoft browsers
	try
	{
		r = new XMLHttpRequest();
	}
	catch(ex)
	{
		// Microsoft browsers
		try
		{
			r = new ActiveXObject("Msxml2.XMLHTTP");
		}
	    catch(ex1)
	    {
			// Other Microsoft versions
			try
			{
				r = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(ex2)
			{
				r = null;
			}
		}
	}

	return r;
}

net.ContentLoader.prototype.sendRequest = function()
{
	// Default method is GET
	if(!this.method)
	{
		this.method = "GET";
	}

	// Make sure content type is correct if POST
	if(!this.contentType && this.method == "POST")
	{
    	this.contentType = "application/x-www-form-urlencoded";
	}

	// Get new request object
	var req = this.createRequest();
	if(req)
	{
		var loader = this;
		req.onreadystatechange = function()
		{
			loader.handleResponse(req);
		}

		req.open(this.method, this.url, true);
		if(this.contentType)
		{
			req.setRequestHeader("Content-Type", contentType);
		}

		// Send any URL encoded parameters
		req.send(this.params);
	}
}

net.ContentLoader.prototype.handleResponse = function(req)
{
	var ready = req.readyState;

	if(ready == net.READY_STATE_COMPLETE)
	{
		// If HTTP status is OK, then invoke callback handler.
		// The "this" reference is implicitly passed to the function
		// and refers to the ContentLoader object 
		// see onreadystatechange event handler)
		if(req.status == 200 || req.status == 0)
		{
			this.observer.notify(req);
		}
		else
		{
			this.observer.notifyError(req);
		}
	}
}

net.ContentLoader.prototype.getText = function()
{
	return this.req.responseText;
}

net.ContentLoader.prototype.getXML = function()
{
	return this.req.responseXML;
}