Automatically closing comments on old posts

After a comment spambot left spam on over a hundred of my posts, I've decided to close comments on posts older than 60 days. I had to write a small plugin to do this. Blosxom users can get it here. You'll also need Jason Clark's storystate plugin.

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Tim, could you please provide a brief how-to on using this plugin? I've not used storystate and interpolate_fancy before, and my perl is well, pretty basic.. :)
Thanks.