i'm using the Floating Thumbnails template, and I'm noticing that it looks MUCH different in Firefox vs IE7?

IE 7 click the link

[url]http://farm1.static.flickr.com/190/506973261_8808e657b8.jpg?v=0[/url]

Firefox click the link

[url]http://farm1.static.flickr.com/220/506973257_ef26144e8b.jpg?v=0[/url]

any thouhts on what may be causing this? I've also noticed that the CMI theme looks much different between the browsers.