Limit number of character on comment post

Oke, just thanks for reading my question :)) what i mean here is, if the commenter enters less than 140 words/characters and tries to submit, a warning comes up, eg: You Must Enter At Least 140 Words”. But, the commenter can’t enter more then 1000 words/characters!

So basically, it tells them they didn’t enter enough information.

Perhaps anybody here know the tricks, please help me. I used WP 2.2.2

Blessing,
D