Each interactive button has three images associated with it.
At first glance, an interactive button looks like a single image. However, after you insert the button, FrontPage actually creates three slightly different images for you. Each image is displayed depending on what people do with the button:
This is the original image. This is the image that appears when the page is loaded. This is also what the button looks like when it is not hovered over or pressed.
This is the hover image. This image appears when someone hovers over the button.
This is the pressed image. This is the image that appears when someone presses, or clicks, the button.
All three images are automatically created when you insert the button in FrontPage.