Hi,

If you are looking for JavaScript for developing Web 2.0 application then jQuery is the best for you. jQuery is a fast, concise, JavaScript Library that you can use to develop UI for web applications.

jQuery simplifies the task of HTML documents traversal. It also help the programmer to handle events, perform animations, and add Ajax to web applications easily.

Learn more about jQuery.

TutorialURL: http://www.roseindia.net/ajax/jquery/

Thanks

Deepak Kumar