Photo fade out/in

I`m quite new to Flash 8 and currently building a site for a photographer.
This includes a window with a series of changing photos.

At the moment these just jump from one to the other but I want to fade the first one out to black then quickly fade the next photo up.

I can manage to do this effect for one photo but Flash doesnt allow me to apply more than one motion tween per layer! Theres 26 photos in total so do I have to have 26 layers to achieve this effect or is there an easier way, perhaps using ActionScript?

Thanks

Toner