The only thing that's wrong with the site is VML was used. That's basically
a format for drawing shapes in a web page, usually done through the use of
FrontPage's drawing tools. Unfortunately, IE supports VML but other browsers
don't although VML is not a new technology. FrontPage does put information
in there to try to keep the page compatible, so FireFox sees this code, but
it's not always 100% the same. There's no way to really fix this, except for
designing it differently. Try to find the elements that you drew and replace
them with graphics done in a graphics program outside FrontPage.
Hope this helps,
Mark Fitzpatrick
Microsoft MVP - FrontPage