Hmm. The only thing I can think of that might work is manipulating the z-index of a number of same-sized preloaded images via onmouseclick. Of course, they might consider onmouseclick to be JavaScript. It isn't, but it's most often used to reference JavaScript. And, even then, I'm not sure if there's a way to do modify the z-index (especially of a different element) without also using JavaScript.

Then again, I'm not a web developer. You should probably wait for Cybjorg to notice.