A good place to ask questions and advice about web development is at the MozillaZine Web Development/Standards Evangelism forum. The helpers at that forum are more knowledgeable about web development issues. You need to register at the MozillaZine forum site in order to post at that forum.

See http://forums.mozillazine.org/viewforum.php?f=25

You need to post a link to the website or relevant parts of the code.

Could you give link to your website, please?

Or at least code of the navigation bar.

Update Firefox, by the way.

After updating to 3.6.2, I lost the ability to use navigation buttons. No suggestion has worked so far. I even disabled security programs...No, I dont have Norton 360..I have been forced to use MSN. Everything was ok before the update.

See http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox