Confluence AUI Button link with username

[Xavier]

Hi all,

I try to add a AUI button on a confluence page, with the current username on the link.
I try :

http://www.toto.com&myparam=$current_user_name

but whatever I test (${req.remoteUser}, $current_user_name...) it not working.

How I can populate my link with current user ?

Thanks in advance.

Regards