Frame by frame 2-3 second animation

I'm looking for a "burning paper" animation. So I have an image that is a rectangle, portrait, 122 x 157 pixels, a piece of "paper", depicting various scenes. I want to achieve a visual look as though the paper is being burnt by a large ball flames arriving directly underneath it in the center, and we are looking at the paper from from above. So the flames should emerge in the center and then rapidly burn the whole paper, leaving ashen remains. The originating "ball of flames" might be roughly a quarter of the size of the rectangle, but arriving directly in the center. I want to be able to play the animation above any number of my scenes. So the animation itself starts almost completely clear, and then the center blackens and bursts into flames and the paper burns quickly, causing some smoke and leaving ash. I'm looking for a pretty realistic effect if possible. Deliverables A sequence of 60 or more images at most 244 x 314 pixels, 72 DPI, PNG, depicting the described animation...
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