/*
url-loading object and a request queue built on top of it
*/

/* namespacing object */
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;


/*--- content loader object for cross-browser requests ---*/
net.ContentLoader=function(id,url,onload){
  this.id=id;
  this.req=null;
  this.onload=onload;
  this.doAjax(url);
}

net.ContentLoader.prototype={
 doAjax:function(url){
  var method="GET";
  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();
      }
      this.req.open(method,url,true);
      this.req.send();
    }catch (err){
			this.req.send(null);
    }
  }
 },
 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(req);
    }
  }
 } 
}