Need Help: Scrolling Background

CLV25

Hi,
I started making a new game today. It's gonna be a platformermstyle game. I would like to include scrolling clouds in the background. How would I do this without making it almost Infinatley long?

rlehm

Basically, they move from x position to x position. Start off screen end off screen. The key is telling them to return to the start location once at their end location. So when cloud reaches = or > x, have it move to the beginning x.

I usually random the y a little.