/* 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)
      {
    	this.req=new ActiveXObject("Msxml2.XMLHTTP");
      }
      if (this.req)
      {
    	try
    	{
    	  var loader=this;
    	  this.req.onreadystatechange=function()
    	  {
    		net.ContentLoader.onReadyState.call(loader);
    	  }
    	  this.req.open(method, url+"?"+params, true);
    	  this.req.send(params);
    	}
    	catch (err)
    	{
    		alert(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());
    }