Hope I explain this right, here goes...

I've replaced the "add to cart" image on the product page with my own, and I'd like to make it so that when the "Add to My Cart" button is hovered over, it changes to another image. I already have the image I would like to change it to, just not sure about how to or where to insert the code to do this. Can anyone help or point me in the direction of a resource? Here is a link.

http://www.thecuterie.com/index.php?..._id=5?xyzallow

I'd like the pink words to change to green, but I have 2 images to do this if I can make it work. Thanks in advance.