pulling username/id into query string?

[redg8r]

Hi,

I'm using the bb version but not activated.
i need to pull a username or userid into a query string or url so I can pass it to another page/script.

when debug mode is enabled the var looks like USER_NAME or USER_ID but i think im getting confused by the template system.

Ive looked everywhere & cant find it.
I wanna add a link on the top navigation area with the username or id included in the string:
http://www.mysite.org/gallery.php?uid=(USER_NAME_VAR)

Anyone have some pointers?
Id appreciate any comments.
Thanks