I've a very limited knowledge of flash but think that what I'm after would work quit well in flash.
Basically what I'm after is a banner like this as an example..

But I'd like the image to change when the screen is refreshed so they could end up with a random picture every visit.
Hopefully you'll understand what I'm getting at. I'd like to have a crack at this myself so just need basic instructions or a tut.
Thanks in advance.