Put all of your JPG images on different layers by order, number one on top.
Then simply put JPG 1 at alpha 100. Then do a motion tween to the same image at alpha 0. Do this numerous times for each one and it should work perfectly.
You should actually try to use ActionScript to fade in and Out your images, that way if you want to make changes or add/take away images you can do it a lot quicker, and focus on other things.