[galerio]

Thank you for the help, but it doesn't work.
I tell you what I need to do:

in file /includes/class_block.php at line 481 replace

$userinfo['avatarurl'] = '';

with

$userinfo['avatarurl'] = 'http://www.gravatar.com/avatar/'.md5($userinfo['email']).'.png?s='.$this->registry->options['gravatar_dimension'].'&d='.$this->registry->options['gravatar_type'].'&r='.$this->registry->options['gravatar_rating'].'';

This is the first of the things I would like to transform in a plugin.
Then in file /includes/blog_functions.php at line 1219 replace the same code above with:

$userinfo['avatarurl'] = 'http://www.gravatar.com/avatar/'.md5($userinfo['email']).'.png?s='.$vbulletin->options['gravatar_dimension'].'&d='.$vbulletin->options['gravatar_type'].'&r='.$vbulletin->options['gravatar_rating'].'';

then in file /includes/class_blog_response.php at line 426 replace with:

$this->response['avatarurl'] = 'http://www.gravatar.com/avatar/'.md5($this->response['email']).'.png?s='.$this->registry->options['gravatar_dimension'].'&d='.$this->registry->options['gravatar_type'].'&r='.$this->registry->options['gravatar_rating'].'';

and then in file \includes\api\1\api_getnewtop.php at line 527 replace with

$userinfo['avatarurl'] = 'http://www.gravatar.com/avatar/'.md5($userinfo['email']).'.png?s='.$vbulletin->options['gravatar_dimension'].'&d='.$vbulletin->options['gravatar_type'].'&r='.$vbulletin->options['gravatar_rating'].'';

If this mod was only for me, then I wouldn't need to create plugins, but I would like to share it with a simple xml product to import.

Any chance to do it?