how to use record type

Help please!

How do I actually insert the variables OLD or NEW or a record type into a
table from within a trigger?

Like doing the following:

drop table th1;
create table th1(
id serial,
text text );

drop table th_audit;
create table th1_audit(
ts timestamp default now()
) inherits(th1);

drop function thaudit();
create function thaudit() returns opaque as '
begin
-- I want to insert OLD into th_audit - how do I do this???
return NEW;
end; ' language 'plpgsql';

drop trigger ta on th1;
create trigger ta before delete or update on th1
for each row execute procedure thaudit();

Reagrds,
Horst