Creating a popup on a front page image

I am developing a website, and need something programmed. My current developer does not know how to do this. My draft website is at the link below - please notice how the front picture mouseovers follow the mouse movement. [login to view URL] I'd like the front graphic to behave like the image on this site. [login to view URL] I also need this to show up on iphone/ipads, so I think it needs to be in HTML5. I'd need the files delivered so my developer can insert.