I am using zenphoto for my personal site where some of the personal photos of mine and my family are put up.I want it to be accessible by only those who have registered to my blog(Registration is moderated by me and by invitation only).I have a guessable and simple URL to the gallery i.e. http://ankitmehta.net/gallery/ and I don't intend to change it to weird names too.Is it possible to make my gallery not accessible to public,only registered users can see it.If yes,How?.

2.WordPress provides diff. User roles,so Can I limited my family albums which are very personal to just my family by changing their roles to higher roles?
(I don't want to show all my friends i.e. some acquaintances my family photos,those who are my near and dear friends I can always change their roles).

I'm unskilled when it comes to coding & programming,please care to reply the solution in a simple steps .

Thanks.
PS: I've read this topics in the forums (I mean I've searched before posting)
http://www.zenphoto.org/support/topic.php?id=3605
http://www.zenphoto.org/support/topic.php?id=2716&replies=2#post-16213