With the proliferation of new, standards-compliant browsers, virtually all users and Web sites can successfully use the latest JavaScript techniques.  This task-based, visual-reference guide has been fully revised and uses step-by-step instructions and plenty of screenshots to give beginning and intermediate scripters what they need to know to keep their skills up-to-date. Readers can start from the beginning to get a tour of the programming language, or look up specific tasks to learn just what they need to know. In this updated ninth edition, readers will find new information on scripting for mobile devices and updated code to work with the latest versions of all major browsers. Readers will also find an expanded focus on getting their JavaScript done quickly by using the near-ubiquitous jQuery library.