What he means by mouseover is that when the user mouse's over the image, it changes. I don't mean this to be rude, but I thought that was the only meaning mouseover had with an image. Hope that clears it up.
On the first post for the thread, I'm not quite sure how you would do it, but I know you can. And, if I may, I would like to offer just a little bit of advice with the website.
I know you are still developing and what it looks like so far could be very promising. However, one little glitch that caught me was the sizing of the site. What I mean is this. Having my resolution at 1024X768 and not having my browser maximized, limited the potential of the website. Just a little something that may need to be looked at. I'm not trying to be rude or critical. I only wanted to let you know what I saw.
Hope everything works out!