On this site the creator just used 'UL' and 'LI' to make a list of images and (most likely) has more code written in the CSS file (/styles/global/topnav.css) to make it work...
I'm not this good at these things but it doesn't look that hard, I tried to google it for you but didn't really find anything useful yet.
The code is written in HTML as you see, I don't know how much experience you have at things like this? But I think it will be possible for you to get the result you wanted ?
Please let me know if I helped you (a little) or if I can help you more ?