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<form action="gaestebuch.php" method="post">
  <p>
    <b>Passwort:</b><br />
    <input type="password" name="login_password" />&nbsp;<input type="submit" value="log in" />
  </p>
</form>

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if (isset($_POST['login_password']))
 {
  if ($_POST['login_password'] == $password)
   {
    $_SESSION['admin'] = true;
    header("location: ".basename($_SERVER["PHP_SELF"]));
    die("<a href=\"".basename($_SERVER["PHP_SELF"])."\">further...</a>");
   }
  else { $action="none"; $show="login failed"; }
 }

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// Settings:

// Name des Gästebuches:
$guestbook_title = 'Gästebuch';

// Administrations-Passwort:
$password = '';

// Datei, in der die Einträge gespeichert werden (benötigt CHMOD 666):
$gbdata = "guestbook.dat";