Image Rollover

Hi,
I’m building a site were there will be a map on the homepage. I want to put in hotspots on the map (different towns) so that when a user hovers over it a more detailed image appears which the user can click on and then having it appear in the sidebar with some information written below it. Any ideas. I am a novice at programming but have experience using dreamweaver.
I will be using Artisteer to build the site.
Any plugins that could do this or something similar. Thanks