Hello there Rogue. I'm not the creator of RS.Net (I'm an Admin though) but then again he doesn't come around to often and I'm not to sure I can awnser your question because I'm not real big on this kind of stuff I do know that HTML stands for Hyper Text Media Language. I think.
I do know that there is a lot of resources on the web that tells you how to use HTML, which is how most banners and pictures are displayed. Mayve someone with better knowledge of this issue can help us out here.