//------------------------------------------------------
// Content Loader
//------------------------------------------------------

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;

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

net.ContentLoader.prototype = {

   loadXMLDoc: function(url) {
      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() {
            loader.onReadyState.call(loader);
          }
          this.req.open('GET',url,true);
          this.req.send(null);
        }
        catch (err) {
          this.onerror.call(this);
        }
      }
   },
    
   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.onload.call(this);
        } else {
          this.onerror.call(this);
        }
      }
   },
    
   defaultError: function() {
      alert("error fetching data!\n" + "url: " + this.url + 
            "\n\nreadyState:"+this.req.readyState
            +"\nstatus: "+this.req.status +"\nheaders: "+
            this.req.getAllResponseHeaders() );
   }
}

//------------------------------------------------------
// End Content Loader
//------------------------------------------------------