var net = new Object();
net.READY_STATE_UNITIALIZED = 0;
net.READY_STATE_LOADING = 1;
net.READY_STATE_LOADED = 2;
net.READY_STATE_INTERACTIVE = 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
			+"\nheaders: "+this.req.getAllResponseHeaders());
	}
}