Totally unique random image loading each time

Does anyone know how to load random images in flash.

I have found many ways to achieve this from this forum, but the problem with each, even outside of Flash and with ASP, that the same image can load a number of times.

Is there a way in which you can have a unique image load each time, so no repeated image is used.

Any source would help out, tutorials for achiving this would be great.