Sorry for the late response. It will actually be a constant block of PHP code that randomly selects 6 images from a directory to display (so it will continuously display pictures). Something like this will be the meat of the PHP code being loaded:
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';
$a = $files[mt_rand(0, $x-1)];
echo '<a href="images/' . $a . '"><img src="thumbs/' . $a . '" border=0></a></br>';