mysql_select_db($db_name, $db);
odnosno
mysql_select_db($db_name);
Možda bolje da se ovako konektuješ...
PHP kôd:
$link = mysql_connect($server, $username, $password, false, 1);
if( ! $link)
die("Unable to connect to database server. ".mysql_error());
mysql_selectdb($database) OR die(mysql_error());
function_exists("mysql_set_charset")? mysql_set_charset("UTF8", $link): mysql_query("SET NAMES UTF8");