Programming using jQuery is more fun than protoype.js, but Ruby on Rails depend on Prototype.js and script.aculo.us strongly. jRails is solution that use jQuery on RoR platform but jRails doesn't have some plugins, auto_complete, in_place_editor and so on. So I release jrails_auto_complete rails plugin. INSTALL % cd /path/to/rails_app % ./script/plugin install http://svn.raku.to/throwaway/jrails_a