Reading an OUT parameter out of a function call

Hi,

I have a simple void function:

CREATE OR REPLACE FUNCTION myfn(myparam OUT int)
AS $$
BEGIN
  pnr := 1;
END;
$$ LANGUAGE plpgsql;

How do I access myparam?
I thought this should work with 9.1/9.2: SELECT (myfn()).myparam;
Or inside another function?

Yours, Stefan