Showing lock next to thread title

[Gstone]

hello,

i removed the topic folders from my theme (new posts, lockfolder, contains posts by you, etc), and i was wondering how i can add a lock next to locked thread names. right now users have to enter the thread to find out if it is locked or not but i would like them to see a lock on forumdisplay so that they choose whether or not to read the locked thread.

is there a variable or template that i can edit to show a Lock image if the thread is locked.

thank you!