Javascript is a scripting language, invented by Netscape, embedded in web pages which adds interactivity and visual effects. To see the effects, you should make sure that your browser is compatible with Javascript and it is enabled. Three major browsers which support it are:


I've only used it for a few simple tricks, such as image flipping and putting messages in the status bar, but it is capable of much more. If you want some more info, then here are some good sites to check out:

BigNoseBird's Javascript A good site with some useful cut-and-paste examples
www.javascripts.com An immense site with hundreds of examples
Netscape's JScript reference site A lot of good info on programming in Javascript
Special Edition: Using Javascript A good accessible site with plenty of information
Another good way to get code from the 'net is to find an effect you like and "View Source" and cut the bits out that you like. Or of course, you could join a usergroup.

Try not to get Javascript and Java confused. They are completely different and people will laugh at you.