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;
// Constructor
net.CargadorContenidos = function(url, funcion, funcionError,elID) {
  this.url = url;
  this.req = null;
  this.onload = funcion;
  this.onerror = (funcionError) ? funcionError : this.defaultError;
  this.cargaContenidoXML(url);
  this.elementID = elID
}
net.CargadorContenidos.prototype = {
  cargaContenidoXML: 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);
       }
     }
  }
}
function muestraContenido() {
   var tvar = this.req.responseText;
   document.getElementById(this.elementID).innerHTML = tvar;
}
function mostrarImatgeLoading()
{
  // document.getElementById(this.elementID).innerHTML = '<%= image_tag "loadings/carrega_allargat.gif" %>';
}
function cargaContenidos(url, elementID) {
  var cargador = new net.CargadorContenidos(url, muestraContenido, mostrarImatgeLoading,elementID);
}