Return number of rows update in query

Hi,    can anybody tell me how to capture the number of rows updated in
an update query inside a stored procedure? This doesn't work but
hopefully you will see what I mean.

CREATE FUNCTION "test" () RETURNS int AS '
DECLARE       v_number_of_rows int;

BEGIN       select into v_number_of_rows         update carbon_user         set email_confirmed = ''Y''         where
email_confirmed= ''Y'';       RETURN v_myvar;
 
END;
' LANGUAGE 'plpgsql';

Thanks in advance!!!

Shane