Which JavaScript framework for this drag-n-drop UI in a ROR3 website?

In a Ruby-on-Rails website, I want to create the following dialog, where a user is shown a list of colors and must choose 3 favorites and 3 least liked colors.

It works by dragging an item from the left and dropping it on the right.

What is the easiest and most maintainable library/method to impleme开发者_运维技巧nt this?

Notes: I am in the process of choosing a JavaScript framework for this website, so any proposition is fine. If that matters, the real thing is actually: among 15 work situations, choosing 5 that the user feels as most stressful, and 5 least stressful.

jQuery UI.

It has draggable and droppable. It is super easy to use, highly configurable and is the new standard javascript library in Rails 3.1.