MySQL ERROR: (1054) Unknown column 's1.id' in 'on clause'
<p>QUERY: <font color=#009900>
                SELECT
                s1.id     AS `id`,
                s1.lft   AS `left`,
                s1.rgt  AS `right`,
                s1.level  AS `level`,
                IF(s1.lft = s1.rgt-1, '0', '1') AS `has_children`
            , d.id,d.title,d.search_title
                    FROM ad_cat_struct AS s1, ad_cat_struct AS s2 LEFT JOIN ad_cat_data AS d ON s1.id = d.id
                    WHERE s2.id = 118
                 AND s1.lft <= s2.lft AND s1.rgt >= s2.rgt ORDER BY s1.lft</font></p>