DB prefix or Table prefix?

Connect.php:

define('DB_HOST', 'mysqlserver.gigahost.dk');
define('DB_USER', 'username');
define('DB_PASS', 'MyPassword');
define('DB_NAME', 'fonsbo_sub');
define('DB_PREFIX', 'mr_');
define('DB_CHAR_SET', 'utf8'); // Character encoding set


My DB prefix is fixed ยด"fonsbo" and your tables are all prefixed with "mr_".  So I'm confused about DB_PREFIX being "mr_" (table prefix)...

Using " mr_" as database prefix does not work. Could you elaborate a little on this?