UJS doesn't work

Rails 3.0.3 Ruby 1.9.1
I am trying to do search form by ajax as shown at "http://railscasts.com/episodes/205-unobtrusive-javascript". But javascript code generated from index.js.erb file does not execute.
I was try to get response by this command:

wget -O response --header='X-Requested-With: XMLHttpRequest' --header='Accept: text/javascript, /' 'http://localhost:3000/posts?utf8=%E2%9C%93&search=main'

and response was right: https://gist.github.com/771588

I am confused why this code does not execute in a browser

Order of my actions:
rails new blog
rake db:create
rails generate controller home index
- write 'root :to => "home#index"' in 'config/routes.rb' - and delete 'get "home/index"' rm public/index.html
rails generate scaffold Post name:string title:string content:text
rake db:migrate
- then i have edited some files attached here