Can you attach a minimized testcase showing the problem? http://bugzilla.mozilla.org/attachment.cgi?bugid=247353&action=enter
Ask for HTML code if needed (t3x)
This bug was last touched before 1.0.4. Is it still reproducable? Try the latest branch build (1.0.5): http://www.mozilla.org/products/firefox/ Try the latest nightly trunk build (v1.0+): http://www.mozilla.org/developer (Reviving old UNCONFs)
Well, the comment 0 problem would have been with whatever was calling the function passing in something undefined, and after two years without a testcase, I'd guess that if we're still doing whatever it was, we intended to do it that way.
<- VERI based upon lack of response since comment 5. If a problem still exists, please reopen this bug, or reference this issue in a new bug report.