charset parameter on sybase_connect dos is disallowed

we often get intermitent charset problems on database operations (onto sybase ase 11.0.3.3-6 using ctlib) and we are tring to find out an way to solve this. reading the php online doc, we discover that there is an parameter in the sybase_conection () function to force a charset for de client connection. unfortunately this does not work, as shown below: Warning: Wrong parameter count for sybase_connect() in /home/oab/public_html/amaral_testes/lixo/sybase-fetch.php on line "x". the code that generate this parse error was this: <?php ... $id_conn = sybase_connect ('SYBASE','sa','', 'iso_1'); ... ?> is this an BUG ? have anyone on the world get passed the same problem? help us please. thanks, Sidney Wagner B Amaral Suport Analyst Ability - Comunicação e Tecnologia www.ability.com.br