Please help: PHP4/postgres db woes

Any postgre experts out there? We have a PHP4 site that worked fine 
under a previous RedHat build, but we just can't get it working on this 
Debian build.

Here's what we're running:

Debian 3.0r1 "woody"
Kernel 2.4.18-bf2.4
Apache 1.3.26-0woo
postgres 7.2.1-2wood
php 4.1.2-6wood

We've applied a script sent to us by the original programmers, that 
installed several logins and passwords.
But when we go to login to our PHP site, our login is rejected.

I've taken the following actions:

1) Checked to see that the database (called "ourdb") is in fact 
available by entering "psql ourdb." The database opens up to an "ourdb" 
prompt.

2) Made sure that postgresql is running by outputting ps ax:

   xxx ?        S      0:00 /usr/lib/postgresql/bin/postmaster
   xxx ?        S      0:00 postgres: stats buffer process
   xxx ?        S      0:00 postgres: stats collector process

3) Altered the pg_hba.conf (located in /etc/postgresql) to reflect the 
following, and re-started postgre:

#local        all                                           ident 
sameuser
local        all                                           trust
host         all         127.0.0.1     255.0.0.0           ident 
sameuser
host         all         0.0.0.0       0.0.0.0             reject

4) Made sure that the php4-pgsql module is present  -- I did an 
"apt-get" for this last week

5) Examined the postgres.log for clues -- the log file is empty, 
indicating that no login attempts have been made -- I suppose because 
the auth.php has not found the DB?

6) pg_exec call deprecated under PHP 4.2.0 and replaced with pg_query: 
since we're using php 4.1.2-6wood, it seems that this does not apply to 
our setup. Correct?

All suggestions welcome. Solution guaranteed posted to the list.

- Danny O'Brien