Definition of JavaScript
JavaScript is an interpreted programming or script language from Netscape. It is somewhat similar in capability to Microsoft'sVisual Basic, Sun's Tcl, the UNIX-derived Perl, and IBM's Rexx. In general, script languages are easier and faster to code in than the more structured and compiled languages such as C and C++. Script languages generally take longer to process than compiled languages, but are very useful for shorter programs.
JavaScript is a client-side programming language (meaning it's run on the user's computer, rather than the site's server). It is used to program advanced behaviors into a website, such as slideshows and other graphical frills. Because some users disable JavaScript on their browsers, nothing crucial to the site's functioning should be programmed in JavaScript.
JavaScript is used in Web site development to do such things as:
Automatically change a formatted date on a Web page
Cause a linked-to page to appear in a popup window
Cause text or a graphic image to change during a mouse rollover
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