Firefox & Java Plugin problem

There is a very good note on plugins and firefox setup. The problem occurs sometimes,

if you install a new JRE after your firefox installation on LInux. Here is the Link :

http://plugindoc.mozdev.org/linux.html

Hitghlighted the Java Plugin & Firefox

Install Java Runtime Environment.

Make a symbolic link to libjavaplugin_oji.so in your Mozilla Plugins directory.

Use the copy located in the plugin/i386/ns7 directory of JRE 5.0 or later, or plugin/i386/ns610-gcc32 if you are using JRE 1.4.2