display_error("Error: Invalid facility ID", "Please check the facility ID and try again.");
    display_footer();
    exit;
}
switch ($_REQUEST['action']) {
    case 'new':
        //ensure that user has sufficient privileges to add a facility.
        if (!$user->isAdmin()) {
            display_error("Error: Insufficient privileges", "You must be an administrator to add facilities.");
            break;
        }
        $facility->displayEditForm("Add a facility");
        break;
    case 'edit':
        if (intval($_REQUEST['id']) != $user->facility['id'] || !$user->isAdmin()) {
            display_error("Error: Insufficient privileges", "You are not allowed to modify this facility.");
            break;
        }
        $facility->displayEditForm("Modify a facility");
        break;
    case 'show':
        $facility->displayProfile($user);
        break;
    default:
    case 'index':
        echo "<h1>Facilities</h1>\n";
        display_facilities($user);
        echo "<a href='facility.php?action=new'>Add a new facility</a><br />\n";
        break;
}
display_footer();