// JavaScript Document
var peticion = false;
  try{
  	peticion=new XMLHttpRequest();
  }catch (trymicrosoft) {
  try{
 	 peticion=new ActiveXObject("Msxml2.XMLHTTP");
  }catch (othermicrosoft) {
  try{
  	peticion=new ActiveXObject("Microsoft.XMLHTTP");
  }catch (failed) {
 	 peticion=false;
  } 
  }
}


if (!peticion)
alert("ERROR AL INICIALIZAR!");

function getById(id){
	return document.getElementById(id);	
}



function cargarFragmento(fragment_url, element_id) { 
	var element = getById(element_id); 
	element.innerHTML = '<p><img src="http://www.dadamotel.com/images/ajax_loading.gif" /></p>'; 
	peticion.open("GET", fragment_url); 
	peticion.onreadystatechange = function() { 
		if (peticion.readyState == 4) { 
			element.innerHTML = peticion.responseText; 
		} 
	} 
	peticion.send(null); 
}