Trying to get hyperlink for "Search this forum"

At the top inside of each forum, I want a hyperlink that searches that specific forum. I tried adding this code into forumdisplay_threadslist but it wouldn't select the forum id.

<a href="search.php?s=&curforumid=$forum[forumid]">Search This Forum</a>

Can somebody help me?

[sparky2]

$foruminfo[forumid]

...but you'll be calling the search without passing a keyword (search term) to it

[Gutspiller]

works. Thanks.