Aligned images in Twenty Ten theme mandatory horizontal space?

Hi, thank you for your time 🙂

Our website for the Invercargill Vegan Society has a page showing vegans around the world. We’d like to have our photos aligned, all touching, no gaps, no spaces, but there always seems to be a mandatory vertical space? Do you know what is causing this? Its been suggested it might be something in our theme somewhere?

http://www.invsoc.org.nz/we-are-invsoc/

When we are editing, the space is NOT there, all the images touch, are in alignment perfectly, no horizontal gaps.

Screenshot of editor
http://www.flickr.com/photos/jaywontdart/7822752840/sizes/l/in/photostream/

Here is the the HTML code for the page, rather tedious to look at, but it will show there are no linebreaks causing the horizontal spaces to be seen. Yet it always seems there are in the published page!

We’d really like to correct this, if you could help, I would be most grateful 🙂

Thank you for your time 🙂

Jordan

[ Moderator note: Way, way, WAY too much code to post here. Please use pastebin.com instead. ]