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JavaScript is the scripting language that is supported by
most browsers, including Communicator and Explorer. Scripts
are little programs that add interactivity to your page. JavaScripts
can be used to add an alert box or a bit of text to your page,
or more complicated scripts that load particular pages according
to your visitor's browser. JavaScript is endorsed by a number
of software companies and is an open language that anyone
can use without purchasing a license. JavaScript requires
no development tools and can be combined with HTML.
By operating on the client-side (interpreted and executed
by your Web browser) JavaScript speeds up simple interactive
behavior without needing to use the network. For example,
simple verification of the data entered into a form (e.g.
numbers only in telephone field) could be carried out in the
browser via JavaScript inside the HTML of the form page. This
reduces server load and speeds up performance at the client
side. In general, the use of an embedded client-side scripting
language can create a more event-driven page, reacting instantly
to user input such as mouse clicks or text entry at the browser.
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