CSS Disjointed images not working? help.

Hi.

I am wanting to create a pure CSS disjointed image gallery using rollovers. (thumbs on the side, rollover and a big image appears in the big space next to it). It worked few a few minutes and then just stopped. I don’t know why and I can’t find the bug. Any help?

problem page:
http://www.mvconstruction.com/wp/?page_id=105

the CSS:
[CSS moderated as per the Forum Rules. Please just post a link to your site.]

The HTML:

[Code moderated as per the Forum Rules. Please use the pastebin]

Thank You!