Mod_rewrite login problem

Hi,

I'd like like to do rewriting like described at
http://www.jahia.org/jahia/page360.html
Mod_jk is already running fine.
My apache httpd.conf looks like:

RewriteEngine On
RewriteRule ^/jahia/Jahia/site/myjahiasite/pid/([0-9]+)$
http://%{SERVER_NAME}/page$1.html [R,L,NS]
RewriteRule ^/jahia/Jahia(.*) - [PT,QSA,L,NS]	# this line does not seem useful
RewriteRule ^/page([0-9]+).html$ /jahia/Jahia/pid/$1 [PT,QSA,L,NS]

It works fine when I'm not loged in. But when I try to log in, I fill the login
pop up, and then I come back to the last page (quite normal) but without the
top bar (my settings, adminitration, edition mode,...).
Any tip?

Cheers
Xavier