avaScript is a compact, object-based scripting language for developing client and server Internet applications. Netscape Navigator interprets JavaScript statements embedded in an HTML page, and LiveWire enables you to create server-based applications similar to Common Gateway Interface (CGI) programs. This book describes the JavaScript language and its use in Navigator. For information on developing server-based JavaScript applications, see the LiveWire Developer's Guide.

• A general understanding of the Internet and the World Wide Web (WWW).
• Good working knowledge of HyperText Markup Language (HTML).

• Part 1, "Using JavaScript in Navigator," introduces JavaScript and describes its use in Navigator. It covers the main features of client JavaScript and touches on some advanced topics.
• Part 2, "The JavaScript languag," describes the syntax and semantics of the JavaScript language itself and is applicable to both client-side and server-side JavaScript. It also describes JavaScript's built-in String, Math, and Date objects, built-in functions, and statement syntax.
• Part 3, "Reference," is a comprehensive, alphabetical reference for Navigator JavaScript. It includes a chapter on JavaScript statements and one for all objects, properties, and methods in Navigator JavaScript.

If you are already familiar with JavaScript in Navigator, skim the material in Part 1, paying particular attention to the chapters that discuss more advanced topics: Chapter 3, "Using windows and frames" and Chapter 5, "Advanced topics." You can then use the reference material as needed.

If you are a LiveWire application developer, use the material in Part 1 to familiarize yourself with the basics of JavaScript. Then read Part 2 for a more in-depth look at the JavaScript language. All the material in Part 2 is applicable to LiveWire JavaScript. You need to read only material on client JavaScript if you want to incorporate only client functionality into your applications.

Figures that show screens were created using Windows NT. Screens on your platform may look different.

This book uses Uniform Resource Locators (URLs) of the form

http://server.domain/path/file.html

This book uses the following typographical conventions:

• File and directory names are shown in fixed-pitch font, for example, c:\javascript\samples\world\hello.html.
• JavaScript method and function names are shown in boldface without any parentheses; for example, write and alert.
• JavaScript object and property names are shown in italics; for example, document.title and Date object.

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