Random links in navigation

[aouton]

Hi all. I hope you can advise something about this issue.

I have a navigation list like this: (this is part of it only, but the part I need advise)

  <li> <a href="valores.php">Valores</a> </li>
  <li> <a href="servicios.php">Servicios</a> </li>
  <li>
    <a href="#">Obras Relevantes</a>
    <ul>
      <li> <a href="cuauhtemoc.php">Cuauhtémoc</a> </li>
      <li> <a href="paseocolon.php">Monumento a Colón</a> </li>
      <li> <a href="zacatecas3.php">Capilla de Nápoles</a> </li>
      <li> <a href="oaxaca.php">Catedral de Oaxaca</a> </li>
      <li> <a href="palacio.php">Palacio Nacional</a> </li>
      <li> <a href="campana.php">Campana de la Independencia</a>         </li>
      <li> <a href="museomex.php">Museo de la Ciudad de México</a>       </li>
      <li> <a href="temploangeles.php">Nuestra Señora de Los Ángeles</a> </li>
    </ul>
  </li>

I like to display only 3 of those links of the 8 (as of today. This sublist won't growth much) When a visitor clicks on any of the 3 I like to display another 3 of them (random or sequential) and so on.

My questions are:

Is this possible?
How to do it?
Makes sense?

Thanks for any comments or advise regarding this.

Angel