Animate Pictures Script - Combine Multiple Images To Make 1 Animated One

We need a script built that will allow users the create animated pictures. The user should be able to pick the amount of images they want to add to create the animated picture. After specifying the amount, that amount of image slots will drop down. They should then be able to browse their computer for the images to fill up these spots. I would like something as close to a live preview as possible. There should be an option to pick how fast the animation goes. If you have any questions feel free to ask. If the budget is too low let me know.