page (http://www.iblist.com/development/iblist/Steven/newindex.php)
raw code (http://www.iblist.com/development/iblist/Steven/code.zip)

The site looks great in IE. That is how it is supposed to look. In Firefox (Mozilla) and Netscape, the white background box behind the recently added books, series, and authors does not display correctly. Also, the copyright info should be center bottom, instead of below the toolbar on the left. I have validated the CSS code.

Does anyone have any ideas?

Here's what you need to do:

At the end of the content box, add <br style="clear: both;" />

In the copyright div, add clear: both; as well.

That should do exactly what you need. :)