upgrade from postgres 8.x to 9.x problem

Hi,

I have a table column name is called begin, tried to move it to
postgresql9 from postgresql8.4. the function failed to call
New.begin.

here is a quick test.

CREATE TABLE test(id serial primary key not null, begin timestamp
without time zone not null);
CREATE TABLE test2(id bigint not null, begin timestamp without time
zone not null);
create or replace function my_test() returns "trigger"
as $$
begin
insert into test2 values (
new.id,
new.begin);
return null;
end
$$
language plpgsql;
create trigger my_trigger after insert on test for each row execute
procedure my_test();

after create everything, run
INSERT INTO test values (default, now());

on postgresql 8.4
INSERT INTO test values (default, now());
INSERT 0 1

on postgresql 9
INSERT INTO test values (default, now());
ERROR: missing FROM-clause entry for table "new"
LINE 3: new.begin)
^
QUERY: insert into test2 values (
new.id,
new.begin)
CONTEXT: PL/pgSQL function "my_test" line 2 at SQL statement

thanks for any help!