hello there helpful one 
how do i make my smoke particles fade out insead of just poping persay
im useing 2.49 too, i just cant figure it out…
also if anyone knows how to make the invisible like heat thing abouve a fire that would be awsome
Thanks in advance 
Use an IPO to scale the object up and then also lower the alpha. You can do this by pressing the I-key when your mouse is over a channel (in the IPO window, I think).
that is a weird way to do it i know that the alpha makes it see through, and u cant scale particles… i think i cant remember well i cant find out how to scale the board particles…