function NAjax(){



    var url = "http://www.librosromo.com/calendario/calendario.php?" + document.getElementById('next').value;

	

    http.open("GET", url, true);



    http.onreadystatechange = AAjax;



    http.send(null);



}



function PAjax(){

	

    var url = "http://www.librosromo.com/calendario/calendario.php?" + document.getElementById('prev').value;

	

    http.open("GET", url, true);



    http.onreadystatechange = AAjax;



    http.send(null);

	

}



function AAjax(){



    if(http.readyState == 4){



    document.getElementById('calendario').innerHTML = http.responseText;



    }



}