How to Share profile avatar among multi-sites

// Database table definitions
define("DB_ADMIN", DB_PREFIX."admin");
define("DB_ADMIN_RESETLOG", DB_PREFIX."admin_resetlog");
define("DB_ARTICLE_CATS", DB_PREFIX."article_cats");
define("DB_ARTICLES", DB_PREFIX."articles");
define("DB_BBCODES", DB_PREFIX."bbcodes");
define("DB_BLACKLIST", DB_PREFIX."blacklist");
define("DB_CAPTCHA", DB_PREFIX."captcha");
define("DB_COMMENTS", DB_PREFIX."comments");
define("DB_CUSTOM_PAGES", DB_PREFIX."custom_pages");
define("DB_DOWNLOAD_CATS", DB_PREFIX."download_cats");
define("DB_DOWNLOADS", DB_PREFIX."downloads");
define("DB_EMAIL_VERIFY", DB_PREFIX."email_verify");
define("DB_ERRORS", DB_PREFIX."errors");
define("DB_FAQ_CATS", DB_PREFIX."faq_cats");
define("DB_FAQS", DB_PREFIX."faqs");
define("DB_FLOOD_CONTROL", DB_PREFIX."flood_control");
define("DB_FORUM_ATTACHMENTS", DB_PREFIX."forum_attachments");
define("DB_FORUM_POLL_OPTIONS", DB_PREFIX."forum_poll_options");
define("DB_FORUM_POLL_VOTERS", DB_PREFIX."forum_poll_voters");
define("DB_FORUM_POLLS", DB_PREFIX."forum_polls");
define("DB_FORUM_RANKS", DB_PREFIX."forum_ranks");
define("DB_FORUMS", DB_PREFIX."forums");
define("DB_INFUSIONS", DB_PREFIX."infusions");
define("DB_MESSAGES", DB_PREFIX."messages");
define("DB_MESSAGES_OPTIONS", DB_PREFIX."messages_options");
define("DB_NEW_USERS", DB_PREFIX."new_users");
define("DB_NEWS", DB_PREFIX."news");
define("DB_NEWS_CATS", DB_PREFIX."news_cats");
define("DB_ONLINE", DB_PREFIX."online");
define("DB_PANELS", DB_PREFIX."panels");
define("DB_PHOTO_ALBUMS", DB_PREFIX."photo_albums");
define("DB_PHOTOS", DB_PREFIX."photos");
define("DB_POLL_VOTES", DB_PREFIX."poll_votes");
define("DB_POLLS", DB_PREFIX."polls");
define("DB_POSTS", DB_PREFIX."posts");
define("DB_RATINGS", DB_PREFIX."ratings");
define("DB_SETTINGS", DB_PREFIX."settings");
define("DB_SETTINGS_INF", DB_PREFIX."settings_inf");
define("DB_SITE_LINKS", DB_PREFIX."site_links");
define("DB_SMILEYS", DB_PREFIX."smileys");
define("DB_SUBMISSIONS", DB_PREFIX."submissions");
define("DB_SUSPENDS", DB_PREFIX."suspends");
define("DB_THREAD_NOTIFY", DB_PREFIX."thread_notify");
define("DB_THREADS", DB_PREFIX."threads");
define("DB_USER_FIELD_CATS", "fusionrsl15_user_field_cats");
define("DB_USER_FIELDS", "fusionrsl15_user_fields");
define("DB_USER_GROUPS", "fusionrsl15_user_groups");
define("DB_USER_LOG", "fusionrsl15_user_log");
define("DB_USERS", "fusionrsl15_users");
define("DB_WEBLINK_CATS", DB_PREFIX."weblink_cats");
define("DB_WEBLINKS", DB_PREFIX."weblinks");
?>