Ruby On Rails features complete Prototype script.aculo.us integration.
Visit the Rails/script.aculo.us demo site for live demos and example code.
First, you need to include the libraries in your app, which is easy, as Prototype and script.aculo.us come prepackaged with Rails.
In your layout or view add this to the
section:
<%= javascript_include_tag :defaults %>
You can now use the Rails JavaScript helpers or use do-it-yourself