contact your host to get information on the correct settings to use in your MySQL connection.
I have this in the Server.php page
<?php
# FileName="Connection_php_mysql.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_server = "msc67.cmsmotion.com";
$database_server = "msc67cms_blacktowerwebsite";
$username_server = "msc67cms";
$password_server = "*****";
$server = mysql_connect($hostname_server, $username_server, $password_server) or trigger_error(mysql_error(),E_USER_ERROR);
?>