On the other side, jQuery Ehchant is meant for special effects. You can see dome cool examples of this library here! To use these, you will need the jQuery core library. So download jQuery 1.2.3! this new release includes support for Adobe AIR, Namespacing and of course, jQuery UI. You can download these libraries at:
jQuery UI: http://jqueryjs.googlecode.com/files/jquery.ui-1.5a.zip
jQuery Enchant: http://jqueryjs.googlecode.com/files/jquery.enchant-1.0a.zip
You can also access all the documentations here. Happy jQuerying!