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;

net.ContentLoader=function(url,onload,onerror,method,params){
	this.url = url;
	this.req = null;
	this.method = method;
	this.params = params;
	this.onload = onload;
	this.onerror=(onerror) ? onerror : this.defaultError;
	this.loadXMLDoc(url);
}

net.ContentLoader.prototype={
	loadXMLDoc:function(url){
		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(this.method,url,true);
				this.req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
				this.req.send(this.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());
	}
}