I've completely re-installed the gallery and was able to upload all those files. Everything seems OK except, as before, the Navbar Links.
When I'm just in my forum, they link correctly. For example, the button for the faq's quite rightly takes you to www.mysite.co.uk/faq.php
But when I'm viewing stuff in the gallery, this button goes to www.mysite.co.uk/galler/faq.php
Any help would be much appreciated