Inanis Glass theme Dan’s Avatar Thingy?

I’m using WordPress 2.7 and the Inanis Glass 1.3 theme. I’d like to use Dan’s Avatar Thingy, but I can’t figure out where to put the required code in the newcomments.php file to make the avatars show up with the comments.
<?php if(function_exists('cmd_show_avatar')){ cmd_show_avatar(); } ?>

Has anyone got this theme and this plugin to work together?
I can get it to work fine when I add it to the index.php file, but I only want to use avatars in the comments, not the main posts. It works fine for me in other themes.