rails w/ jquery

This may or may not answer your question, but I recently discovered a
rails plugin called jrails which integrates jquery into rails very
similar to the way prototype comes in rails.

installing jrails allows you to use this:
<%= javascript_include_tag :defaults %>
to include jquery library files
and there are other benefits and integrations, some of which i am
pretty sure include helper methods for rjs.
so i would try looking into the details for jrails... hope that
helps... J