/*
	  url-loading object and a request queue built on top of it
	  */
	  
	  /* 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,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';
	    }
	    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.send(params);
	      }catch (err){
	        this.onerror.call(this);
	      }
	    }
	  }
	  
	  
	  net.ContentLoader.onReadyState=function(){

	    var req=this.req;
	    var ready=req.readyState;
	    //var httpStatus=req.status;
	    if (ready==net.READY_STATE_COMPLETE){
	      //if (httpStatus==200 || httpStatus==0){
	        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());
	  }