Please try Validating your code...
(this will require the inclusion of DocType and CharSet!)
Quite often this sort of thing occurs due to tags/elements not being closed properly... esp. in very compliant browsers such as MFF.
It may also be due to quirks/non-standard mode being implemented by defautl, or the difference of code (you code in strict, it reads it as transitional // you code it as xhtml, it reads it as html).
Onceyou ahve that done, you may find the issue has disappeared
(Hint: When workig through Validation errors, start at the top of the file and work down, as some reported errors are acaused by previous ones above!).
No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.