This project was built with rails 3.0.9.
Now i updated the gems and Gemfile =>
source \'http://rubygems.org\' gem \'rails\', \'3.1.1\' # Bundle edge Ra
RJS has been abstracted out of Rails 3.1 and JQuery is the new default.
http://weblog.rubyonrails.org/2011/4/21/jquery-new-default
If you would like to use RJS, you need to include
gem 'prototype-rails'
in your Gemfile