can't retrieve data through PHP

my script that does insert works correctly, but i get this error when
retrieving data:

Warning: pg_exec(): supplied argument is not a valid PostgreSQL link
resource in /home/httpd/htdocs/view.php on line 115

Warning: pg_num_rows(): supplied argument is not a valid PostgreSQL
result resource in /home/httpd/htdocs/view.php on line 118

i am using postgreSQL 7.2.3, php/mod_php 4.2.2 on Gentoo Linux.

  - bruce

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