Use the right image class.

index.html

@@ -7,7 +7,7 @@
 		{% if forloop.first %}
 		<a href='http://{{post.slug}}.usesthis.com/' title='View an interview with {{post.person}}.'><img src='/images/portraits/{{post.slug}}.jpg' alt='{{post.person}}' width='500' height='335' class='portrait'></a>
 		{% else %}
-		<a href='http://{{post.slug}}.usesthis.com/' title='View an interview with {{post.person}}.'><img src='/images/thumbnails/{{post.slug}}.jpg' alt='{{post.person}}' width='500' height='100' class='portrait'></a>
+		<a href='http://{{post.slug}}.usesthis.com/' title='View an interview with {{post.person}}.'><img src='/images/thumbnails/{{post.slug}}.jpg' alt='{{post.person}}' width='500' height='100' class='thumbnail'></a>
 		{% endif %}
 	</figure>