Featured Thumbnails

Hi
I’m trying to get the second row of featured content secondary to display. I have the first 4 posts working fine which are called by:

<div class="entry-thumbnail">
<a href="<?php the_permalink(); ?>"><?php the_post_thumbnail(); ?></a>
</div>

But I can’t get the next 4 to featured posts to appear underneath them, any pointers on where I’m going wrong? Great theme by the way, well done!
Ant