The two buttons below will just take you to dummy target pages. Press the "Go back" button to return to this page. What is special is that it uses JavaScript to highlight the button when the mouse passes over it. This is done by exchanging one image for another.

The images below are also rather neat. When the mouse passes over the image, it turns into a button, and when clicked, the button appears to depress. It is not perfect, as the image of the depressed button takes a while to load, and in the meantime your browser is looking for the target page.