function with unknown params

i've declared and implemented e function like:

CREATE OR REPLACE FUNCTION acquistoLotto(m_g INTEGER, grossista VARCHAR(20),
produttore BIGINT, costo INTEGER, dat DATE, descr VARCHAR(120), num_prod
INTEGER) RETURNS VOID AS $$

but when i'm trying to call it like

select acquistoLotto(0, 'grossista', 52187073424, 10, 22/1/2013, 'ciao ciao
ciao', 10);

an error occours:

ERROR: function acquistolotto(integer, unknown, bigint, integer, integer,
unknown, integer) does not exist

How it's possible that the second and the sixth args it's unknown type? i've
create another function that takes varchar as args and call in the same way
and no errors occours.

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