function creaAjax(){
  var objetoAjax=false;
  try {
   objetoAjax = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
   try {
     /*Para explorer*/
     objetoAjax = new ActiveXObject("Microsoft.XMLHTTP");
     } 
     catch (E) {
     objetoAjax = false;
   }
  }

  if (!objetoAjax && typeof XMLHttpRequest!='undefined') {
   objetoAjax = new XMLHttpRequest();
  }
  return objetoAjax;
}

 function FAjax (url,capa,valores,metodo)
{
   var ajax=creaAjax();
   var capaContenedora = document.getElementById(capa);

 if(metodo.toUpperCase()=='POST'){
        document.write="Hello";
    ajax.open ('POST', url, true);
    ajax.onreadystatechange = function() {
         if (ajax.readyState==1) {
//                 capaContenedora.innerHTML="<img src='loading.gif' width='32' height='32' border='0' title='Loading...'>";
         }
         else if (ajax.readyState==4){
            if(ajax.status==200)
            {
			$("#" + capa).html(ajax.responseText)
            }
            else if(ajax.status==404)
                 {
                     capaContenedora.innerHTML = "<span class='menu'><b>Intentelo más tarde</b></span>";
                 }
             else
                 {
                     capaContenedora.innerHTML = "Error: ".ajax.status;
                 }
        }
    }
    ajax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    ajax.send(valores);
    return;
}
if (metodo.toUpperCase()=='GET'){

    ajax.open ('GET', url, true);
    ajax.onreadystatechange = function() {
         if (ajax.readyState==1) {
//                 capaContenedora.innerHTML="<img src='loading.gif' width='32' height='32' border='0' title='Loading...'>";
         }
         else if (ajax.readyState==4){
            if(ajax.status==200){ 
			$("#" + capa).html(ajax.responseText)

                 //document.getElementById(capa).innerHTML=ajax.responseText; 
            }
            else if(ajax.status==404)
                 {

                     capaContenedora.innerHTML = "<span class='menu'><b>Intentelo más tarde</b></span>";
                 }
                 else
                 {
                     capaContenedora.innerHTML = "Error: ".ajax.status;
                 }
        }
    }
    ajax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    ajax.send(null);
    return
}
}