I want to install plugin Java in Iceweasel (Debian 4.0r1)

Step 1: I downloaded Java from the SUN website and installed it in /usrjava/

Step 2 : For the configuration I had to follow:

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Mozilla 1.4 and later

1. Go to the plugins sub-directory under the Mozilla installation
directory :-(
cd <Mozilla installation directory>/plugins
2. In the current directory, create a symbolic link to the JRE
ns7/libjavaplugin_oji.so file Type:
ln -s <JRE installation
directory>/plugin/i386/ns7/libjavaplugin_oji.so

Example:
* If Mozilla is installed in this directory:
/usr/lib/mozilla-1.4/
* and if the JRE is installed at this directory:
/usr/java/jre1.5.0
* Then type at the terminal to go to the browser plug-in
directory:
cd /usr/lib/mozilla-1.4/plugins
* Enter the following command to create a symbolic link to the
Java Plug-in for the Mozilla browser.
ln -s /usr/java/jre1.5.0/plugin/i386/ns7
/libjavaplugin_oji.so .
3. Start Mozilla browser or restart it if it is already running. Note
that if you have other Mozilla components (ie: Messenger, Composer, etc)
running, you will need to restart them as well.
4. Go to Edit > Preferences. Under Advanced category > Select Enable Java
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Q: Which directory is the plugin directory for Icewaesel (Mozilla 5.0) to
put the symbolic link ?

I found these (and more):
/usr/share/iceweasel/chrome/classic/skin/classic/mozapps/plugins
/usr/share/iceweasel/chrome/en-US/locale/en-US/mozapps/plugins
/usr/share/iceweasel/chrome/toolkit/content/mozapps/plugins
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Tnx
Henk