JavaScript
JavaScript adds interactivity to a web page and can be used to perform many functions that HTML can't. Below is an example of a slideshow which works by using the limited version of the Document Object Model that was first available in Netscape's version 3 browser. This allowed the name attribute to be given to an image tag and this name to be referenced by JavaScript.
This takes the form
<img src="some_graphic.jpg" name="some_name">
The object can then be referred to by JavaScript thus
document.images["some_name"].src=another_graphic.jpg;
All that's needed is to set the image source value using an onClick event handler, which forces the browser to download a new graphic image in place of the old.
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