switch ($op)
{
case "INIC":
include ("inicio.html");
break;
case "QUIE":
include ("quienes.html");
break;
case "SERV":
include ("servicios.html");
break;
case "PROD":
include ("productos.html");
break;
case "MAQU":
include ("maquinas.php");
break;
case "CONT":
include ("contacto.php");
break;
default:
include ("inicio.html");
break;
}
?>