Upload the files to the /wp-content/plugins/gravatar-box/ directory
Activate the plugin through the 'Plugins' menu in WordPress
Add this to your comments form somewhere:
if (function_exists('gravbox')) gravbox();
Add styling for it into your style.css.
The gravbox() code adds a div with id of "gravbox".
The image has the "gravatar" class, and is wrapped inside another div with a class of "gravatar_frame".
The no-gravatar link is inside a p with a class of "nogravatar".
This should be enough for any styling needs. If you wish to further alter the result or the size of the gravatar, edit the gravbox.js file.
Requires: 2.8 or higher Compatible up to: 3.2.1 Last Updated: 2010-8-21 Downloads: 15,133