Help with water "like" movement! PLEASE

The complexities of simple animations still confuses me. I wanted to achieve an effect that is widely used on many sites. As I say widely, I contradict myself as I cannot find a site that uses this technique :stuck_out_tongue: Therefore, I will try and describe it. It looks like waves rising up the screen. Its not as simple as a **vectored wave **rising using a motion tween, but, it looks like a real movement of waves rising.

I am not asking about REAL LIFE looking waves but simple one coloured image of an animated wave rising. The waves are constantly changing and its very hard to describe.

If someone has done, or knows how to, create an animation like this please help me by posting their .fla. Iā€™m very very very desperate.