<h3>List categories</h3>

<ul>

	<?php 



	$categories = get_categories('exclude=28'); 



	foreach($categories as $cat){



		echo '<li style="float: left;">';



		$catPost = get_posts('numberposts=1&category='.$cat->cat_ID.'');



		$post = $catPost[0];



		setup_postdata($post);



		echo '<a href="'.get_category_link( $cat->cat_ID ).'"><img style="margin:0px 18px 18px 0px; height: 225px; width: 225px; display: block;" src="/wp-content/themes/portfolio/scripts/timthumb.php?src='.get_post_meta($post->ID, "image", true).'&h=225&w=225&zc=1&q=100" alt="'.$post->title.'" /></a>';



		echo '<h4><a href="'.get_category_link( $cat->cat_ID ).'">'.$cat->cat_name.'</a></h4>';



		echo '</li>';



	}

?> 

</ul>