Comment form: how do I clear the data from name and email when the form is submitted?

Currently when a user submits a comment the info in the comment box clears upon submission, but their name and email address remain. Is it possible to set the whole form to clear?

Thank you!

What version of Atahualpa, WP and PHP?
What comment form are you using?
What is the url?

Ata 3.2
WPMu 2.7.1

Its the default comment form that is part of the blog page at http://www.polkcitysquare.com.

Thanks for your help!
-Kimberly

This is not done by the theme but either by WP or the browser. The email/user name is only visible to the particular user, and he can overwrite it too. Other users don't see it.