/* 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(url,on_load,on_error,method,params,contentType){
  this.req=null;
  this.on_load=on_load;
  this.on_error=(on_error) ? on_error : 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';
  }
  if (window.XMLHttpRequest)
  {
 this.req=new XMLHttpRequest();
  }
  else if (window.ActiveXObject)
  {
   //add try catch;
   try {
      this.req = new ActiveXObject("Msxml2.XMLHTTP");
   }catch (e1){
     try {
      this.req = new ActiveXObject("Microsoft.XMLHTTP");     
      } catch (e2){
    }
   }
     //
 //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.send(params);
 }
 catch (err)
 {
   this.on_error.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){
   this.on_load.call(this);
 }else{
   this.on_error.call(this);
 }
  }
}
net.ContentLoader.prototype.defaultError=function(){
  alert("error fetching data!"
 +"\n\nreadyState:"+this.req.readyState
 +"\nstatus: "+this.req.status
 +"\nheaders: "+this.req.getAllResponseHeaders());
}