Show "lock" icon on locked forums, but not to guests

[Jordan17]

Currently I have the lock icon showing on forums that are closed. For guests, or people who arent logged in, you can see a big line of big red X's. It doesn't look too good for guests, so I was wondering if there is a way I can turn it off for guests, but not for actual users.

go to www.lost-interactive.com - long line of X's. If you log in they don't show (only 1 on a locked forum).

Any ideas?