Did you create the link from your browser's plugin directory to the libjavaplugin_oji.so file?
to root, cd to your browser's plugins directory (/usr/lib/mozilla/plugins or something to that effect probably), then type ln -s /usr/local/java/j2sdk-1.4.2_02/jre/plugin/i386/ns610-gcc32/libjavaplugin_oji.so .
(your path will probably be different).
to exit superuser mode and fire up your web browser. Type about
lugins in the location bar and if you've done it right you should have a lot of Java-related entries there.