I stumbled upon the script today while looking for something else and figured, what the hell. So I downloaded it and figure it out. So now you should have a handy little "SpellCheck" button when you respond to a post.
Unfortunately, the way I have the main citadel coded makes it unrealistic for me to actually add it to our main posts. The good thing is that I have already implemented it on V2.0 so the new site already has spell check on the submissions.
I have issues with it in Opera, but hey.