In order for a browser to display image rollovers, it needs to be able to understand JavaScript, and how to manipulate images. Some older browsers knew a little about JavaScript but couldn’t ...

As always, only use this code if the browser you’re designing for supports image manipulation via JavaScript (that is, Netscape 3 or later and Internet Explorer 4 or later). So, this code starts ...

images which are clicked must remain in that state until another image is clicked (see rule #2), they are temporarily immune to mouse movements; thus, the setNormal() and setHover() functions ...