I'm creating a design for my web design class and I want to add a feature like that of www.amzia.net where his navigation images rollover somewhere else... Is this Javascript? HTML? Which is easier and does anyone have any code/explanations for it?

Thank you.

I believe that's JavaScript

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-06,GGLD:en&q=javascript+%2B+rollover+images