return setof record - strange behavior

Hi everybody. Can anyone enlighten me what's wrong with this function :

CREATE OR REPLACE FUNCTION month_year(mon integer, intv integer, OUT
ro integer, OUT mi integer) RETURNS SETOF record AS
$BODY$
DECLARE
w    record;
cy    integer := EXTRACT (YEAR FROM current_date);

BEGIN

FOR w INSELECT (CASE WHEN  m > 12 THEN cy + 1 ELSE cy END)::integer, (CASE
WHEN  m > 12 THEN m - 12 ELSE m END)::integerFROM generate_series(mon + 1, mon + intv) AS m
LOOPRETURN next;
END LOOP;

END;

$BODY$ LANGUAGE 'plpgsql' VOLATILE;


SELECT * FROM month_year(10, 5);

Why does it return empty SET ? The amount of rows is correct though ....
I'm running 8.1.4

regards
mk