var net = new Object();

net.READY_STATE_UNINITIALIZED = 0;
net.READY_STATE_LOADING = 1;
net.READY_STATE_LOADED = 2;
net.READY_STATE_INTERACIVE = 3;
net.READY_STATE_COMPLETE = 4;

net.ContentLoader = function(url, onload, onerror, method, params, contenttype) {
	this.url = url;
	this.req = null;
	this.onload = onload;
	this.onerror = (onerror) ? onerror : 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) {
			this.req = new ActiveXObject("Microsoft.XMLHTTP");
		}
		if (this.req) {
			try {
				var loader = this;
				this.req.onreadystatechange = function () {
					loader.onReadyState.call(loader);
				}
				this.req.open(method, url, true);
				if (contenttype) {
					this.req.setRequestHeader("Content-Type", contenttype);
				}
				this.req.send(params);
			} catch (err) {
				this.onerror.call(this);
			}
		}	
	},

	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.onload.call(this);
			} else {
				this.onerror.call(this);
			}
		}
	},	
		
	defaultError : function() {
		alert("Error fetching data!" +
					"\n\nreadyState: " + this.req.readyState +
					"\nstatus: " + this.req.status +
					"\nhreaders: " + this.req.getAllResponseHeaders());
	}
	
}