Since the author seems to be MIA, here's a fully modified copy with most of the suggestions here a tweak of my own:
http://pastebin.com/f54da753e
Nested quotes seem to work okay? Was there a problem?
Demo of nested:
http://bbshowcase.org/forums/topic/put-your-test-posts-here?quote=7#post-240
I'm going to try at some point to make a BBcode version of this that uses dynamic linking (where the link isn't hard coded) so it's less confusing to novice posters. ie.
[quote=post123]This is quoted[/quote]
is a bit more clear and easy to follow in the textarea box.
