how i can check out if a user has already posted a forum?

i would like to know how i can check out if a user has already posted a thread in a forum or not.

i need this for i.e.

if the user already has already started a thread then goto change_his_thread_template
else
goto new_thread_template

whats the sql string for ??

select what ?? from ?? WHERE userid = ]$bbuserinfo[userid]
and when its true or false

it would be fine if u could tell me what i have to do in my php.

thx a lot !

-Toppi

[Mike Sullivan]

SELECT threadid FROM thread WHERE forumid='$forumid' AND postuserid='$bbuserinfo[userid]'

But this is hacking, so moving to hacking section...

thx a lot ED

ill check it out.