I looked around and found this on one of the usenet groups
Netscape on the Mac does not support JDK 1.1.x at this time. Try using
MSIE 4.x on the Mac using Apple's MRJ as the Java VM (you can set this
in MSIE's preferences).
This message was dated sometime Jan '99.
and this too
When using MS IE 4.5 w/ MRJ 2.1 it (the java applets) work correctly. Don't
know if that helps a lot, but it appears to be a NN problem.