// JScript 文件

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){
  this.url=url;
  this.req=null;
  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('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(){
 
 }
}