Simple Animation Issue

Hi all,

I have a slight issue with the simplest of animation, purely a cloud animation however despite creating a seamless cloud image, when the animation ends the loop, it jumps. It been ages since i have done any animation and wondered if anyone can help solve this problem?

I have attached the work file, Flash CS3

http://www.gigasize.com/get.php?d=p6oho8r4mbf

Get back soon

Alex