Problem with Frames in Netscape on a MAC

When working with frames in Netscape on the Mac, the frames are getting cut off on the left and top.  We end up getting a 2 to 5 pixel grey line on the bottom and right side.  The more frames we use on the page, the larger the line becomes.  Here is an example: 
It also works perfect in IE on the Mac and both browsers on the PC.
Any Ideas???
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what version of Netscape is the Mac running?  my Communicator 4.6 didn't show anything unusual at all.  no grey line.
Take a look at:

try fixing the size of the margin to 0 and make sure the frameborder is set to off

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