I can access the HTML but I'm not a coder, all I do is copy/paste the Banner location where the Banner is located. The Showcase is different than the Forum and Gallery which allow for random rotating of multiple Banners, the Showcase doesn't. Here  is the HTML code for how the Showcase is setup for the Banner, if you can code it for what your talking about I can change it and try it out.

Fractal Gallery Guidelines

Remember...No matter where you go there you are