I found this:

jRails is a drop-in jQuery replacement for Prototype/script.aculo.us on Rails. Using jRails, you can get all of the same default Rails helpers for javascript functionality using the lighter jQuery library.

jRails provides drop-in functionality for these existing Rails methods.

o Prototype
o form_remote_for
o form_remote_tag
o link_to_remote
o observe_field
o observe_form
o periodically_call_remote
o remote_form_for
o submit_to_remote

o Scriptaculous
o draggable_element
o drop_receiving_element
o sortable_element
o visual_effect

o RJS
o hide
o insert_html
o remove
o replace
o replace_html
o show
o toggle

Click here.