It may also be a stupid question, but anyway:
How do you get the fog to move itself? I've seen it in a couple of game in the forum.
It's not a script. You set it when you set up the fog, like so:
(https://rmrk.net/proxy.php?request=http%3A%2F%2Fimg234.imageshack.us%2Fimg234%2F2573%2Ffogpiczx0.jpg&hash=64040bdcb4aec40f1eb58df96c7035741ffb887b)
See those SX, SY thingies?
You can think of that as X speed and Y speed. The higher the number, the faster it moves. As well, the sign determines direction. The directions work like this:
North: + Y value
East: + X value
South: - Y value
West: - X value
And the magnitude determines speed. So -5 is as fast as +5, but in the opposite direction.
I hope that helps. Post back if you still have questions.