if your web browser installed in /usr/local/netscape, then you can search that directory, you will find a subdir name like /usr/local/netscape/plugin(i am not sure). then when you download a jdk, it should include java plugin for netscape(may be other web browser), let say it's name javapluginfornetscape (i am not sure either), after you install this jdk you can find this plugin file ,then copy to /usr/local/netscape/plugin, the final step is let the browser use java plugin. in netscape <<Edit>>==> <<Preferences>>.
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