Mine

<?php

	$dh = opendir("images");
	$i = 0;
	
	while (($file = readdir($dh)) !== false)
	{
		if ($file == "." || $file == ".." || $file == "thumbs") continue;
		
		$i++;
		$thumb = "images/thumbs/$i.jpg";

		if (($i % 4) == 0)
		{
			echo "</tr><tr>";
		}

		echo "<td><table cellpadding='0' cellspacing='0' align='center'><tr><td align='center' class='banner'><a href='images/$file' target='_new'><img src='$thumb' width='150' height='112' border='0'></a></td></tr></table></td>";

	}
	
?>