help with include

Hi, I need some help with the include function. I have a phpBB script and want to put the config.inc.php file in a password protected directory, Easy peasy you might say, and I know it is, but the problem comes because the password protected directory isn't on the site the script is on, mainly because the host says I've got to upgrade my account to use password protected dir's. I've got one site with a password protected dir available and would like to put it on there. Any idea's how to do it would be appreciated. Many thanks Brian