Removing pollution from log files

I'm using PostgreSQL  PostgreSQL 8.2.4   from ODBC 08.02.0300 client.

Postgres  log files are polluted with messages

2007-08-27 06:10:38 WARNING:  nonstandard use of \\ in a string literal at
character 190
2007-08-27 06:10:38 HINT:  Use the escape string syntax for backslashes,
e.g., E'\\'.
2007-08-27 06:10:39 WARNING:  nonstandard use of \\ in a string literal at
character 197
2007-08-27 06:10:39 HINT:  Use the escape string syntax for backslashes,
e.g., E'\\'.
2007-08-27 06:10:47 WARNING:  nonstandard use of \\ in a string literal at
character 190
2007-08-27 06:10:47 HINT:  Use the escape string syntax for backslashes,
e.g., E'\\'.
2007-08-27 06:10:48 WARNING:  nonstandard use of \\ in a string literal at
character 197
2007-08-27 06:10:48 HINT:  Use the escape string syntax for backslashes,
e.g., E'\\'.

How to force Postgres not to write those messages to log file ?
Should I configure ODBC driver, Postgres or change my application ?

Andrus.