animated fire texture

How EXACTLY would I create realistic, animated fire texture? I know how to play the animated texture in the GE, but how do I get the actual fire with the 0 alpha background? The only thing I thought of is rendering a particle fire??? But then how would I do transparent background? (IF that is the correct way to do it.)

Need answer!!!

PLEASE answer someone!!!

try he had a flamethrower sure you can learn something there.