DD Tab Menu script - IE Issues

[boltonian]

1) Script Title: DD Tab Menu script

2) Script URL (on DD): http://www.dynamicdrive.com/dynamicindex1/ddtabmenu.htm

3) Describe problem:
Hi there,
I am having a problem with the above mentioned script. I have just applied it to an Invision Power Board template at the following URL
http://www.myteamtalk.info/
If you load the site in FireFox, the menu looks perfect, but if load it in IE, it initially looks good, but once you click a few of the options they all revert to a white background, until all you have left is 5 completely white tabs (but they still change to light blue upon hovering)
What's stranger still in that I have set up a separate menu here: http://www.myteamtalk.info/test.html and that works fine in IE.
Which has me thinking it is something to do with my forum software, maybe the CSS is clashing somewhere (but why does FireFox not have any problems)

Appreciate any help

Cheers
Bolt

[ddadmin]

I tried using IE7 and navigating a few pages on your forums (clicking a few links), and the top menu still works as expected. Can you be more specific how to recreate the problem in IE?