Google Analytics Rails helper

gistfile1.rb

#   <%= google_analytics 'UA-XXXXXX-XX' %>
# </body>

# application_helper.rb

module ApplicationHelper
  def google_analytics(id)
    content_tag :script, :type => 'text/javascript' do
      "var _gaq = _gaq || [];
      _gaq.push(['_setAccount', '#{id}']);
      _gaq.push(['_trackPageview']);
      (function() {
        var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
        ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
      })();".html_safe
    end if id && Rails.env == 'production'
  end
end