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_COMPLITE=4;

net.contentLoader=function(url, onload, onerror){
	this.url=url;
	this.req=null;
	this.onload=onload;
	this.onerror=(onerror) ? onerror : this.defaultError;
}

net.contentLoader.prototype={
	loadXMLDoc:function(){
		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('GET', this.url, true);
				this.req.send(null);
			} catch(err) {
				this.onerror.call(this);
			}
		}
	},
	onReadyState:function(){
		var req=this.req;
		var ready=req.readyState;
		if (ready==net.READY_STATE_COMPLITE){
			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.getAllResponceHeaders);
	}
}