Grant blanket permissions on a database

I am using PostgreSQL-7.1.2_2 on a FreeBSD 4.4-STABLE server. I am running
Apache on the same machine, and have a PHP website that connects to the
PostgreSQL server on localhost. I want the user that the website connects
as to have full permission to do anything it wants on that particular
database, so it seemed like it would be reasonable to add to my pg_hba.conf:

host mydatabase 127.0.0.1 255.255.255.255 crypt

This works, in general. However, I always get errors similar to:

Warning: PostgreSQL query failed: ERROR: sysusers_usersys_seq.nextval: you
don't have permissions to set sequence sysusers_usersys_seq

when trying to insert data into a table with a serial field. Shouldn't the
host line allow that user full permission to create, drop, and update every
element in the database?
--
Kirk Strauser
Internet Software Engineer
NMotion, Inc.