Here's a tutorial I made for a simple Flash gallery, it has some very simple but very useful actionscript which is easy for leaner's to pick up and apply to many other scenarios.
I zipped everything up and attatched it, if you decide to use it I'd appriciate it if you could host the .fla, and change the link, or not include it, as my small host won't be able to cope with bandwidth.
Hope you find this useful: Here's an online version
http://www.speedkick.co.uk/gallerytut