Netscape and IE discrepancies

Its important to have both programs allow flawless html pages…but Im having one problem when viewing my page on netscape.

Any suggestions?
Ive tried to adjust the table width for the navigational bar, but no matter what size i try, I will still get the skinny bar on the right of Newsletter.

At first I though perhaps the Newsletter gif may actually have that verticle bar within the pic, but that is not the case either.