I think I know what you're going to say next.... about the tabs not reaching the edges in IE?
Create yourself an IE only stylesheet for the offending images;
(more info: http://css-tricks.com/how-to-create-...ly-stylesheet/ )
HTML changes to the offending image tags;
...and I think the bottom right tab needs tweeking too but I'll leave you to follow my starting points...
<IMG src="snails_files/nassarius3.gif" class="nassarius3" >
<IMG border=0 src="snails_files/video.gif" srcover="videoover.gif" class="snails-video" >