reg page (part 2)

ok i made a reg page and now when i register it says:
Fatal error: Call to undefined function mssql_connect() in C:\wamp\www\register.php on line 83

this is line 83:
$conn = mssql_connect($config['host'], $config['user'], $config['pass']);
$sel = mssql_select_db($config['base']);

and this is my config:
<?php
$config['host'] = 'JURIEN/SQLEXPRESS'; // IP Address
$config['user'] = 'sa'; // Database Username
$config['pass'] = '123'; // Database Password
$config['base'] = 'GunzDB'; // Database Name
$config['ip'] = YOU WANNA KNOW HUH; // Your IP
$config['port'] = '6000'; // GunZ Online Port
?>

im using this page:
http://forum.ragezone.com/attachment...7&d=1169596355