in details.php find: "comment_user_ip" => $comment_user_ip,
Insert below: "lang_show_user_images" => preg_replace("/".$site_template->start."user_name".$site_template->end."/siU", format_text($comment_row[$i][$user_table_fields['user_name']], 2), $lang['show_user_images']),
"url_show_user_images" => ($comment_user_id != GUEST) ? $site_sess->url(ROOT_PATH."search.php?search_user=".urlencode($comment_row[$i][$user_table_fields['user_name']])) : REPLACE_EMPTY,
Then in comment_bit.html template use:{if url_show_user_images}<a href="{url_show_user_images}">{lang_show_user_images}</a>{endif url_show_user_images}