function select(mes,ano)
{
	ajax=nuevoAjax();
	ajax.open("GET", "tools/calendar.php?mes="+mes + "&ano="+ano);
	ajax.onreadystatechange=function()
	{
   	    if (ajax.readyState==4)
      		document.getElementById('calendario_lateral').innerHTML = ajax.responseText;
    }
    ajax.send(null);
}