Yeah, that particular flash .swf file is pre-set to use his images. I think you can see why the vendor he used does it that way: If they allowed you to just pass in XML (say) to specify the set of images, then anybody could rip off copies whenever and wherever they wanted to.

If you had the source code for that .swf, you could surely modify it to accept the parameters. But good luck getting the company to part with the source code.