Notice: Undefined index: avatar in index.php on line 1105 
Notice: Use of undefined constant FORUM_AVATAR_GIF - assumed 'FORUM_AVATAR_GIF' in index.php on line 1107 
Notice: Use of undefined constant FORUM_AVATAR_JPG - assumed 'FORUM_AVATAR_JPG' in index.php on line 1111 
Notice: Use of undefined constant FORUM_AVATAR_PNG - assumed 'FORUM_AVATAR_PNG' in index.php on line 1115 
Notice: Use of undefined constant FORUM_AVATAR_NONE - assumed 'FORUM_AVATAR_NONE' in index.php on line 1119

switch ($forum_user['avatar'])
    {
        case FORUM_AVATAR_GIF:
            $avatar_filename = $forum_user['id'].'.gif';
            break;

        case FORUM_AVATAR_JPG:
            $avatar_filename = $forum_user['id'].'.jpg';
            break;

        case FORUM_AVATAR_PNG:
            $avatar_filename = $forum_user['id'].'.png';
            break;

        case FORUM_AVATAR_NONE:
            $noavatar = TRUE;
            break;
        default:
            $noavatar = TRUE;
            break;
    }
?>
<?php echo $lang_portal['Welcome'] ?>: <strong><?php echo forum_htmlencode($forum_user['username']) ?></strong>

<?php if(!isset($noavatar)) { ?>
<p style="text-align: center"><img src="<?php echo($base_url); ?>/<?php echo($forum_config['o_avatars_dir']); ?>/<?php echo($avatar_filename); ?>" id="whoavatar"/></p>
<?php }
?>