Looking in the template, that is determined by "forum_$forum[statusicon].gif", so $forum[statusicon] seems to be either 'old' or 'new'. Looking in forumdisplay.php, that is determined by the function fetch_forum_lightbulb which is in functions_forumlist.php around line 365. You can probably use that function for your own purposes or if you have access to the variable $forum[statusicon] on your page, you can use that to toggle between your two gifs.
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