Unnamed

<?php

if ($GET['show'] == 'audio')
{
  print('audio');
}
elseif ($_GET['show'] == 'video')
  print('video');
}

?>

<p>
<a href="whee.php?show=audio">Audio</a>
</p>

<p>
<a href="whee.php?show=video">Video</a>
</p>