I'm trying to get some cloud images to scroll across the screen and reset when they go off-screen, starting the whole animation again. I have four cloud images that I want to float gently across.
Any help?

@stephen,

check for the cloud if it has gone off the screen by using

where N is the cloud number that you want to check for

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cloudN:setReferencePoint(display.TopRightReferencePoint)
local xPoint = cloudN.x
if x<=0 then
 cloudN:setReferencePoint(display.TopLeftReferencePoint)
 cloudN.x = _W
end