[mad@Max]

Why don't create a table... I think this character is not necessary:

CREATE TABLE IF NOT EXISTS`". TABLE_PREFIX ."`helpfulanswer` (

Second error (when i click Yes or No):
in javascript window

			SELECT post.goodrank,post.totalrank

			FROM vb_post

			WHERE postid = 4914;

MySQL Error     : Unknown column 'post.goodrank' in 'field list'

---------------
So, you should change your query in file helpfulanswers.php on this code:

PHP Code:

        $helpfulanswer = $db->query_first_slave("
            SELECT post.goodrank, post.totalrank
            FROM " . TABLE_PREFIX . "post AS post
            WHERE post.postid = $postinfo[postid]
        "); 


---------------
Third error
In file helpfulanswers.php missed prefix:

	$helpfulanswers = $db->query_read_slave("
		SELECT postid,post.title as posttile,post.goodrank,post.totalrank,thread.threadid,thread.title as title
		FROM " . TABLE_PREFIX . "post as post		
		INNER JOIN " . TABLE_PREFIX . "thread AS thread ON(post.threadid = thread.threadid)		
		WHERE goodrank > 0
		ORDER BY goodrank DESC
		LIMIT 0,$helpans_limit
	");