Pages that work in IE but not Firefox - what's missing?

[Chris G]

I'm looking for accomodation and other information in France and keep
hitting sites which don't work in Fierfox.  For example:-

    http://www.ville-castres.fr/_tourisme_site//index.php

The page comes up but the menu on the left and a picture are blank,
not having the menu makes it rather difficult to use!  In IE (I run
XP in VirtualBox) the site appears OK complete with picture and menu.

I have Flash installed in Firefox so is there something else missing
or is there something wrong with my Flash installation or is it
something else entirely?

Oh, I'm running Forefox 3.0.6 on xubuntu 8.10.

-- 
Chris Green