Script and Table Confusion! Help!!

OK...here goes.
I've just published the test page I spoke of along with a few notes.
For those folks who have helped me so far, the notes are for you. The site is only available to you (and other forum members who may wish to help) and are purely to help explain my intentions and hopes for the site's development.

The CATS page is the one we discussed yesterday: how to include nav buttons etc. I know HTML-wise that it's probably a bit rough and there are certain bits I'm not sure about eg. the head of the page but...

Anyhoo. I'd really like you to have a wee look. I'm not quite 'there' yet but I'm getting nearer to what I want - with a bit tuck here and bit tweak there! (Sounds like me getting ready for a Saturday night out!)
If the CATS test page is generally ok, the rest of the pages will follow. As I explain on the home page, that's just one category: there's a lot more to come...eeek! What have I let myself in for?!

http://www.mohawks.pwp.blueyonder.co.uk/