$query4 = mysql_query("SELECT * FROM comments WHERE content_id = '$id' AND     content = 'thread'
                  INNER JOIN users ON comments.poster = users.id
	              ORDER BY comments.date ASC");
while ($comment = mysql_fetch_array($query4)) {
}

SELECT *
FROM comments
INNER JOIN users ON comments.pooster = users.id
WHERE comments.content_id = '$id'
ORDER BY comments.date ASC

SELECT *
FROM comments
INNER JOIN users ON comments.pooster = users.id
WHERE comments.content_id = '$id'
ORDER BY comments.date ASC