Problem with animating clouds

I know how to animate stuffs. :kir: But the problem is that the clouds are really giving me headache. As u noe, if u cut up the image of a cloud, it would not be equal bcos of the shape and so i have problem animating it because i wanted to cut it up into a few pieces and animate them but i have a problem. I know theres a way to solve this problem but somehow i jsut can think how.Please help me asap.This is what happens :esmirk:

this layered appearance as u can see. the images not connected properly