serverside scripting?
you can just throw images in a folder and if you have any kind of serverside scripting options, use that to read the contents of the director into loadable varaibles by flash which can then load the images via loadmovie. If no ss scripting, you could manually make a textfile and load that in instead - or just always use the same image names and swap them out if you need to.
If you need a lot of information to be associated with the images, you might want to consider an xml file for organization. It depends on how flexible you need to be.
