/* namespacing object */
var net = new Object();
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;
/*--- content loader object for cross-browser requests ---*/
net.ContentLoader = function (url, on_load, on_error, method, params, contentType) 
{
	this.req = null;
	this.on_load = on_load;
	this.on_error = (on_error) ? on_error : this.defaultError;
	this.loadXMLDoc(url, method, params, contentType);
};
net.ContentLoader.prototype.loadXMLDoc = function (url, method, params, contentType) 
{
	if (!method) {
		method = "GET";
	}
	if (!contentType && method == "POST") {
		contentType = "application/x-www-form-urlencoded";
	}
	if (window.XMLHttpRequest) {
		this.req = new XMLHttpRequest();
	} else {
		if (window.ActiveXObject) {
		//add try catch;
			try {
				this.req = new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch (e1) {
				try {
					this.req = new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch (e2) {
				}
			}
		//this.req=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	if (this.req) {
		try {
			var loader = this;
			this.req.onreadystatechange = function () {
				net.ContentLoader.onReadyState.call(loader);
			};
			this.req.open(method, url, true);
			if (contentType) {
				this.req.setRequestHeader("Content-Type", contentType);
			}
			this.req.send(params);
		}
		catch (err) {
			this.on_error.call(this);
		}
	}
};
net.ContentLoader.onReadyState = function () 
{
	var req = this.req;
	var ready = req.readyState;
	if (ready == net.READY_STATE_COMPLETE) {
		var httpStatus = req.status;
		if (httpStatus == 200 || httpStatus === 0) {
			this.on_load.call(this);
		} else {
			this.on_error.call(this);
		}
	}
};
net.ContentLoader.prototype.defaultError = function () 
{
	alert("error fetching data!" + "\n\nreadyState:" + this.req.readyState + "\nstatus: " + this.req.status + "\nheaders: " + this.req.getAllResponseHeaders());
};