I need a help of a scripter.

[myth-simba]

Hi.
I've been trying by myself for ages and asked around on servers but nobody helped.

I'm trying to make a picture of a cloud float slowly to the left and repeat itself.
Anyone know how?
Also i'm trying to make it so its easily adjustable, like the speed easily changed and image of cloud.
I'm making an offline level where your on top of a fast moving flying fortress.
Sounds crazy but i got loads of ideas for it.
But its nothing without the clouds. without them it won't look like its moving at all.
Please anyone? can you help?
All i need is this cloud script.
I handle the rest.