/*
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;
net.asynch = true;

/*--- content loader object for cross-browser requests ---*/
net.ContentLoader = function(url, onload, onerror, method, params, contentType, as) {
    this.req = null;
    net.currentLoader = this;
    this.onload = onload;
    this.onerror = (onerror) ? onerror : this.defaultError;
    if (as == undefined) {
        as = true;
    }
    net.asynch = as;
    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);
            }
            //alert(net.asynch);
            this.req.open(method, url, net.asynch);
            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;
  try{var httpStatus=req.status;
  if (ready==net.READY_STATE_COMPLETE){
    if (httpStatus==200 || httpStatus==0){
      this.onload.call(this);
    }else{
      this.onerror.call(this);
    }
  }
  }
  catch(e){}
}

net.ContentLoader.prototype.defaultError=function(){
 // alert("error fetching data!"
 //   +"\n\nreadyState:"+this.req.readyState
 //   +"\nstatus: "+this.req.status
 //   +"\nheaders: "+this.req.getAllResponseHeaders());
}