Entiendo.
Listo, así:
Cita: <?php
if (!isset($_SERVER['HTTP_REFERER'])){
echo "<span class='comment'>Warning: your web browser is not supporting HTTP_REFERER vars, so some PHP scripts in this page will fail. Please allow SERVER vars or change your browser for editing tasks on this web.</span>";
}
?>
La logica esta bien? Se puede habilitar "algo" desde el navegador?