adding flash to an image

Hi, Is there a way to add flash to an image (making it an swf)? What my client needs is to have header images on websites that contain an image of water. But he wants the water to appear to move.

So we have an image of a river, and it looks like the current is moving. Or an image of a waterfall, and it seems to be falling.

I know it's not something I can do myself, but I don't even know who to hire to do it, or if it can be done. That's why I'm coming to you. so the questions are:

1. Can it be done?
2. Do I look for a flash expert to do it?
3. If it can't be done, where can I find flash images of this kind of thing, to purchase?

here's an example of what I mean: http://www.memorialsolutions.com/sitemaker/sites/Wolani1/