PGAdmin "Jobs"

Please assist me in implementing this for the first time?
I have installed Postgres 8.1.4 on my laptop, including Admin, then accessed
the database "postgres" from PGAdmin 1.4.2 and run the "pgagent.sql" script
tp populate the database with the following result:-

NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_jobagent_pkey" for table "pga_jobagent"
NOTICE: CREATE TABLE will create implicit sequence "pga_jobclass_jclid_seq"
for serial column "pga_jobclass.jclid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_jobclass_pkey" for table "pga_jobclass"
NOTICE: CREATE TABLE will create implicit sequence "pga_job_jobid_seq" for
serial column "pga_job.jobid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_job_pkey" for table "pga_job"
NOTICE: CREATE TABLE will create implicit sequence "pga_jobstep_jstid_seq"
for serial column "pga_jobstep.jstid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_jobstep_pkey" for table "pga_jobstep"
NOTICE: CREATE TABLE will create implicit sequence "pga_schedule_jscid_seq"
for serial column "pga_schedule.jscid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_schedule_pkey" for table "pga_schedule"
NOTICE: CREATE TABLE will create implicit sequence
"pga_exception_jexid_seq" for serial column "pga_exception.jexid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_exception_pkey" for table "pga_exception"
NOTICE: CREATE TABLE will create implicit sequence "pga_joblog_jlgid_seq"
for serial column "pga_joblog.jlgid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_joblog_pkey" for table "pga_joblog"
NOTICE: CREATE TABLE will create implicit sequence
"pga_jobsteplog_jslid_seq" for serial column "pga_jobsteplog.jslid"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pga_jobsteplog_pkey" for table "pga_jobsteplog"

Query returned successfully with no result in 1407 ms.

...but these objects don't appear in PGAdmin under the postgres database. If
I rerun all or part of this script, it says the object already exists, and I
can see the objects through psql from the command line, eg: select * from
pgagent.pga_jobstep.

How do I get these objects to appear in PGAdmin please, and how do I get the
schema "Information Schema" to appear too?