You have 10.5 (Leopard ) right?
From my experience there seems to be two java issues
One related to the user account which the KB article and one related to the whole system itself which I find happens when someone does the update with everything running...
System.log should state JavaPluginCocoa.bundle is crashing.
If it is,remove from Mac HD->Library->Internet Plug-Ins.
Then I would re-install the latest java update
http://www.apple.com/downloads/macosx/apple/application_updates/javaformacosx105update5.html