Temporary tables privileges

Hi, I'm new at pg.
I'll be using tmp tables in others rdbms. An user can create your own
tmp tables (grant temporary tables) but can't drop it (I don't want to
grant drop privileges).
Other way it's using on commit; but I can't make this work.

Example:
CREATE TEMPORARY TABLE tmp ON COMMIT DROP AS
SELECT code FROM mytable WHERE code BETWEEN 1 AND 10;

shows error near ON

Thanks. Alejandro.