/** XHConn - Simple XMLHTTP Interface - bfults@gmail.com - 2005-04-08        **
 ** Code licensed under Creative Commons Attribution-ShareAlike License      **
 ** http://creativecommons.org/licenses/by-sa/2.0/                           **/ 
function XHConn()
{
  var xmlhttp, bComplete = false;
  try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }// Si es IE
  catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }// en caso que sea una versión antigua
  catch (e) { try { xmlhttp = new XMLHttpRequest(); }  // Si es Mozilla, Safari etc
  catch (e) { xmlhttp = false; }}}
  if (!xmlhttp) return null;
  this.connect = function(sURL, sMethod, sVars, fnDone)
  {
    if (!xmlhttp) return false;
    bComplete = false;
    sMethod = sMethod.toUpperCase();

    try {
      if (sMethod == "GET")
      {
        xmlhttp.open(sMethod, sURL+"?"+sVars, true);
        sVars = "";
      }
      else
      {
        xmlhttp.open(sMethod, sURL, true);
        xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
        xmlhttp.setRequestHeader("Content-Type",
          "application/x-www-form-urlencoded");
      }
      xmlhttp.onreadystatechange = function(){
        if (xmlhttp.readyState == 4 && !bComplete)
        {
          bComplete = true;
          fnDone(xmlhttp);
        }};
      xmlhttp.send(sVars);
    }
    catch(z) { return false; }
    return true;
  };
  return this;
}

// todo es correcto ahora vamos con la funcion de llamar a la pagina

function mostrar_pagina(pagina_requerida, post_variables, id_contenedor)
{
/*document.getElementById(id_contenedor).innerHTML = "<img src='wait.gif' /><br />Procesando...";*/
document.getElementById(id_contenedor).innerHTML = "<img src='wait.gif' />";
	var peticion = function (oXML) { document.getElementById(id_contenedor).innerHTML = oXML.responseText; };
	myConn.connect(pagina_requerida, "POST", post_variables, peticion);	
}