/* 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());
}