Read my tutorial and follow it : http://mugenguild.com/forumx/index.php?topic=104470.0
When you know how to create a stage, then you know how to create a background animation, since it's exactly the same type of code.
Thanks, I'm going to carefully read this.
EDIT: Okay, I think, I got it.
If the background really should start to animate, I'll solve this topic.
EDIT2: Okay, it's finally animating, but now, there is a black border. How can I remove it?
Also, for everyone, who is interested into the code, here it is:
Spoiler, click to toggle visibilty
[VersusBG 1]
type = anim
actionno = 300
;spriteno = 300,0
start = 0,0
tile = 1,1
;velocity = 0,1.5
[Begin Action 300]
300,0, 0,0, 2
300,1, 0,0, 2
300,2, 0,0, 2
300,3, 0,0, 2
300,4, 0,0, 2
300,5, 0,0, 2
300,6, 0,0, 2
300,7, 0,0, 2
300,8, 0,0, 2
300,9, 0,0, 2
300,11, 0,0, 2
300,12, 0,0, 2
300,13, 0,0, 2
300,14, 0,0, 2
300,15, 0,0, 2
300,16, 0,0, 2
300,17, 0,0, 2
300,18, 0,0, 2
300,19, 0,0, 2
300,20, 0,0, 2
300,21, 0,0, 2
300,22, 0,0, 2
300,23, 0,0, 2
300,24, 0,0, 2
300,25, 0,0, 2
300,26, 0,0, 2
300,27, 0,0, 2
300,28, 0,0, 2
300,29, 0,0, 2
300,30, 0,0, 2
300,31, 0,0, 2
300,32, 0,0, 2
300,33, 0,0, 2
300,34, 0,0, 2
300,35, 0,0, 2
300,36, 0,0, 2
300,37, 0,0, 2
300,38, 0,0, 2
300,39, 0,0, 2
300,40, 0,0, 2
300,41, 0,0, 2
300,42, 0,0, 2
300,43, 0,0, 2
300,44, 0,0, 2