To get a feel for what jQuery UI is capable of, check out the UI demos.
In the demos section, the navigation lists all of the interactions and widgets that jQuery UI offers. Choose an interaction or widget and you'll be presented with several demo configurations for that particular plugin. Each demo allows you to view source code, change themes, and the URL can always be bookmarked.
You can download the attached file to start work with jQuery. To start using jQuery just add the following line to your code: