Аватарка автора темы

[Lynx]

'AUTHOR_AVATAR' => ($t_data['topic_poster'] != ANONYMOUS) ? get_avatar($t_data['user_avatar'], $t_data['user_avatar_type'], !bf($t_data['user_opt'], 'user_opt', 'allow_avatar'), 50, 50) : '',

Для R552:

'AUTHOR_AVATAR'      => ($t_data['topic_poster'] != GUEST_UID) ? get_avatar($t_data['user_avatar'], $t_data['user_avatar_type'], !bf($t_data['user_opt'], 'user_opt', 'allow_avatar'), 50, 50) : '',