I installed and customized the totally awesome theme from css tricks:

http://theglobalwineindustry.com/the-be ... sa-donoso/

But, as you can see in the link above the comments/gravatar stuff is wacked:

"Fatal error: Call to undefined function: gravatar() in /nfs/c05/h02/mnt/74160/domains/theglobalwineindustry.com/html/wp-content/themes/PersonalHomepageTheme/comments.php on line 41"

I can't find the gravatar plugin Chris used. Is there another one I can use? What should its settings be?

Cheers,

Dave