Rails HAML helper method to display Twitter Bootstrap alert boxes

application_helper.rb

module ApplicationHelper

  # Display alert box with message or optional block
  def alert_box(alert_type = :info)
    haml_tag :div, :class => 'row-fluid' do
      haml_tag :div, :class => "span9 alert alert-#{alert_type}" do
        haml_tag :a, '×', :class => 'close', :'data-dismiss' => 'alert'
        block_given? ? yield : msg
      end
    end
  end

end

show.html.haml

- alert_box :info do
  %strong Notice:
  You can put what ever HAML in here.
  %br
  And even put in in multiple lines