div box dropping down page?

Hi all,
I'm trying to put a slide show in an expanding div
hopefully you will see what I am trying to do
by looking at the folowing page in
IE.
http://www.uk-conference-venues.co.uk/august-4.html

In FF and Opera though, the div containing the
slide show is dropping to the bottom of the page.
Am I missing something simple here?
TIA.