function not valid

hi..all

I've install postgresql 7.2.2 on redhat linux 8.0, i've tried connect
postgres pass through from client with php, but i got some problem with
argument ar function like this;

************************************
Warning: pg_connect() unable to connect to PostgreSQL server: FATAL 1: No
pg_hba.conf entry for host 127.1.1.0, user postgres, database pegawai in
/var/www/html/pgclass/database.inc.php on line 94

Warning: pg_exec(): supplied argument is not a valid PostgreSQL link
resource in /var/www/html/pgclass/database.inc.php on line 155

Warning: pg_numfields(): supplied argument is not a valid PostgreSQL result
resource in /var/www/html/pgclass/database.inc.php on line 384

Warning: pg_fetch_row(): supplied argument is not a valid PostgreSQL result
resource in /var/www/html/pgclass/database.inc.php on line 256
*****************************************

and  I think I need some postgresql function, so what can I do..?, if I need
to install this argument...how the way...?


Best Regards,

--devi munandar