Lots of high-res images can really spruce up a Web site. But they can also slow it down-- images are files, files use bandwidth ... So if you have JavaScript that swaps an image on mouseover ...

So, this code starts off by checking to see if the document.images ... will understand the image object, which means that it has the ability to manipulate images via JavaScript (which is what ...

The most commonly used JavaScript effect on the Web is the image rollover. For the one person with access to the Web who’s never seen one before, an image rollover happens when you move your ...