Changing size of user avatar in template file In node.tpl I currently display a users avatar' using this code

theme('user_picture', $account)


My avatars are currently set to 85x85px but when they are displayed in nodes I want them to be smaller. How can I change the size for just this inclusion of user avatars?
This is definitely the command you want to run

theme('imagecache', 'your_custom_preset', $picture, $alt, $alt);


You will have to install imagecache module for Drupal 6.  Its in core for Drupal 7.   You have to define 'your_custom_preset', in the imagecache profiles.

The other place you can theme the avatar is inside the function
[YOUR_THEME_NAME]_preprocess_user_picture(&amp;$variables)  and again use the same line as above. for more information checkout the api.drupal.org documention on this issue