cannot display templates

Hi!
When I click on template button in 6 button menu I get error message like this:
....
Warning: pg_exec(): Query failed: ERROR: invalid input syntax for integer: "" in /usr/local/htdocs/secure/https.www.ekonerg.hr/Anketa/include/class_pgsql.php on line 55
Query Error

MySQL Error : Query Error
Message : ERROR: invalid input syntax for integer: ""
Date : Tue, October 12, 2004 10:32:04
....

I use Postgresql database 7.4.1 and I have make changes in class_pgsql.php
...
function query($query_strg)
{
$query_strg = eregi_replace("limit ([ 0-9]+]),([ 0-9]+)", "LIMIT \\2 OFFSET \\1", $query_strg);
.....
}