[FIXED]CREATE OR REPLACE FUNCTION catalog.path(int, int) RETURNS SETOF catalog.tree AS $tree_path$
DECLARE
f_lft INTEGER;
f_rgt INTEGER;
l_lft INTEGER;
l_rgt INTEGER;

BEGIN
SELECT lft, rgt INTO f_lft, f_rgt FROM catalog.tree WHERE id=$ 1 ;
SELECT lft, rgt INTO l_lft, l_rgt FROM catalog.tree WHERE id=$ 2 ;
SELECT * FROM catalog.tree WHERE (lft BETWEEN f_lft AND l_lft) AND
													(rgt BETWEEN f_rgt AND l_rgt); 													
END;				
$tree_path$ LANGUAGE plpgsql;[/FIXED]