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, query_string, funcionError) {
this.url = url;
this.req = null;
this.onload = funcion;
if(!query_string){
	this.query_string = "";
	}else{
this.query_string = query_string;
	}
this.onerror = (funcionError) ? funcionError : this.defaultError;
this.cargaContenidoXML(url);
}
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('POST', url, true);
this.req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
this.req.send(this.query_string);
} 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("Se ha producido un error al obtener los datos"+ "\n\nreadyState:" + this.req.readyState+ "\nstatus: " + this.req.status+ "\nheaders: " + this.req.getAllResponseHeaders());
}
}