[painter theme] Adding Rotating Images to Custom Header in Painter Theme

I host a blog at http://www.flyfisharkansas.com and I use the Painter Theme. I am having trouble figuring out how to get a rotating image for the header. I have a series of 5 images (eventually I would like this to grow, but right now there are 5 different headers) that I would like to randomly appear during the page load. I am thinking I need to use an image rotator script but because of the css of this forum and the custom header ability of it already, I am curious where and how to accomplish this. Anyhelp would be appreciated.

Thanks,
Matt Tucker