Problem with Menu maker using firefox

[chris_gog]

Hi,
My company has an intranet, and the person who created the site (no longer working here) used Xara menu maker for our intranet. Now, the menu works fine in IE, but won't even show up in firefox.
The rest of the site was made using dreamweaver, and I have the latest version of menu maker.
I try and upload the page, but I'll have to check with my boss first, just incase
Any ideas?
Thanks,
Chris