JavaScript Mouseover Issue in Opera - DIV expands on mouseover

Hello

I’d really appreciate some help with this bug I’m encountering. I’ve tested across IE7, Firefox, Chrome, Safari and the only browser I experience this issue in is Opera.

I have 3 icons at the bottom of the page (facebook, rainbow, charity logo) and on mouseover the whole site expands downwards (it’s not supposed to do that). I’ve googled for reasons why it would do this but have found none. Any ideas?

The site in question is: http://www.truly-unique.co.uk/default-2.asp

Many thanks in advance to anyone who can help!

To add to my confusion, I added a border to the DIV above the DIV which contains the rollerover images and now the issue in Opera does not occur.

So I’ve sort of fixed it but I am still curious as to why this happened, plus the fix isn’t the best but it will probably work for me…