HI! Problems with cursors into triggers

HELLO!

I'm making one trigger (plpgsql) and in the function i use CURSOR for to
bring an elements and to take them to a variable but no me it does not
work, WHY?????????????

The script is:

DROP TRIGGER miTrig on otro;
DROP FUNCTION miFunc();
DROP TABLE otro;
DROP TABLE cual;

CREATE TABLE otro (
cuenta integer;
);

CREATE TABLE cual (
cuenta1 integer;
cuenta2 integer;
);

CREATE FUNCTION miFunc () RETURNS OPAQUE AS '
DECLARE
Cuenta_t INT4;
BEGIN
begin work;
declare c_Cuenta CURSOR FOR SELECT * FROM otro;
FETCH forward 1 in c_Cuenta INTO :Cuenta_t;
CLOSE c_Cuenta;
commit;
INSERT INTO cual VALUES (Cuenta_t,NEW.cuenta);
RETURN NEW;
END; '

LANGUAGE 'plpgsql';

CREATE TRIGGER miTrig AFTER INSERT ON otro FOR EACH ROW EXECUTE
PROCEDURE miFunc();

Help me please!!!!!!!!!!!!!!!

Thanks

Mauricio Marín
Colombia