limit comment entries

Does any one know how to put a limit on the number of text entered on the comment box?

On the message box, this can be done in Admin., but I could not find a place to do the same thing for the comment box?

help.....

I thought the Comments box & the Message box where the same thing?

Nope. They are not the same. The comment box/form has its own PHP
script, (comment.php) and the message box/form has its own PHP
script (addentry.php). If I know PHP, I would go and modify the
comment.php and put a limit on the text being entered. The addentry.php
takes its limit number from the admin setup. 'max message length'.