i'm installing drupal 4.6.5 on my pc and get this message when accessing http://localhost/drupal/ :

Warning: Wrong parameter count for mysql_connect() in c:\apache\htdocs\drupal\includes\database.mysql.inc on line 31

i'm sure that i don't have anything wrong changing the setting.php :

$db_url = 'mysql://myuserid:mypassword@localhost/drupal';
$db_prefix = '';
$base_url = 'http://localhost/drupal/';

the account have all privilleges.
is there anything wrong?
please help me. thanks

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