Urgent problem - How easy is it to change the db name?

I have an urgent problem with a CMS that I've set up. By default the database name is CMS, but the server I'm trying to upload to won't accept a 3-letter db name. I've re-named databases before in phpmyadmin and don't have a problem with that, but I don't want to start down that route then find that nothing's working because there's a line of code somewhere that says "cms" when it should say "newname" - if anyone can give me a steer on this I'd be really grateful - I have to have this ready for the client to look at in the next 12 hours or so and really, really don't want to have to start over....

Just update the database name in the /Connections/ file by hand. Should be only referenced once.

OK, I've changed the name of the database in phpmyadmin from 'cms' to 'anax' and changed the connection script, but when I log in on my testing server now, it brings up a blank page... (/CMS/admin/users_login.php)
I'd assumed that if I changed the name of the database and then changed the name in the connection script that it would be necessary to make other changes - for instance, one of my pages has this code which was generated by PowerCMS which I completed earlier:
<?php
include('cms/WA_CMS/addotsite.php');
echo WA_getCMSContent($database_localhost, $localhost, 'about.php' , 'content');
?>

wouldn't that need to change to
include('anax/WA_CMS/addtosite.php'); ?

Ray - ignore that last message, not sure what happened there, but I realised I'd changed the main Connections file, not the one inside the CMS folder. Everything seems to be doing what it should now, thanks for your quick response.