/**
 * @author pversai
 */
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,parameters){
	this.url=url;
	this.req=null;
	this.onload=onload;
	this.onerror=(onerror)? onerror : this.defaultError;
	this.loadXMLDoc(url,method,parameters);
}

net.ContentLoader.prototype = {
	loadXMLDoc:function(url,method,parameters){
		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);
				}
				if (method == "POST") {
					this.req.open("POST", url, true);
					this.req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
					this.req.setRequestHeader("Content-length", parameters.length);
					this.req.setRequestHeader("Connection", "close");
					this.req.send(parameters);
				}
				else {
					this.req.open("GET", 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_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());
	}
}