The simplest way, hands down, is to simply include the sfJqueryReloadedPlugin in your project. This also enables you to include the sfAdminDashPlugin which makes for easy navigation and a nice login screen for your back-end systems.
However, the problem with jQuery Reloaded, is that it is both old, and for our purposes, incomplete.
Since the last update to jQuery Reloaded, jQuery has progressed to version 1.4.2 (from 1.3.2), and more importantly jQuery UI has upgraded to 1.8.2 (from 1.7.3) and added some very nice and easy pieces we can use in our quest to simplify some of the widgets users are commonly presented.
The other problem we will run into with jQuery Reloaded, is that it doesn’t provide the CSS half of the jQuery UI library, meaning we would not be able to see any widgets we used properly.