simle search (railscasts episode 37) with autocomplete?

Hi guys,

sorry if it's pretty easy, coz I'm still a newbie...

how do I add the autocomplete feature to the simple search introduced
by Ryan Bates in the railscasts episode 37 (http://railscasts.com/
episodes/37-simple-search-form)

Thank you very much!

Josef

take look at:

http://www.theregister.co.uk/2007/01/15/ajax_rails_tutorial/