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;

function getHttpRequest() {
    var http = false;
    
    if( window.XmlHttpRequest ) {
        http = new HttpRequest();
    } else {
        http = new ActiveXObject("Microsoft.XMLHTTP");
    }
    return http;
}

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

net.ContentLoader.prototype.loadXMLDoc=function(url,method,params,contentType){
  if (!method){
    method="GET";
  }
  if (!contentType && method=="POST"){
    contentType='application/x-www-form-urlencoded';
  }else{
    contentType='application/x-www-form-urlencoded;charset=utf-8';
  }
  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(){
        net.ContentLoader.onReadyState.call(loader);
      }
      this.req.open(method,url,true);
      if (contentType){
        this.req.setRequestHeader('Content-Type', contentType);
        this.req.setRequestHeader('AsyncRequest', 'Y');
      }
      
      //var enc_params = uriEncode(params);
      
      this.req.send(params);
    }catch (err){
      this.onerror.call(this);
    }
  }
}


net.ContentLoader.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){
      // An Exception occurs, the message was responded.
      /*
      if (this.req.responseText != "") {
    	  alert(this.req.responseText);
    	  return;
      }
      */
      this.onload.call(this);
    }else{
      this.onerror.call(this);
    }
  }
}

net.ContentLoader.prototype.defaultError=function(){
  alert("error fetching data!"
    +"\n\nreadyState:"+this.req.readyState
    +"\nstatus: "+this.req.status
    +"\nheaders: "+this.req.getAllResponseHeaders());
}


function uriEncode(data) {
    if(data != "") {
    	data = "&" + data;
        var encdata = '';
        var datas = data.split('&');
        
        for(i=1;i<datas.length;i++) {
            var dataq = datas[i].split('=');
            encdata += '&'+dataq[0]+'='+encodeURIComponent(dataq[1]);
        }
    } else {
        encdata = "";
    }
    return encdata;
}