Question about passing User defined types to functions

is there a example on how to pass user defined types into
a function??

What I am looking for is something of this nature.

CREATE TYPE dumby_type AS (dumby_id int4, dumby_name text);

create function kick_dumby(dumby dumby_type) returns INTEGER AS '
DECLARE
somenumber integer;
BEGIN
return 1;
END;
' language 'plpgsql';

Is there some way of doing this, because the above doesn't work.