flash.rb

module FlashHelper
  
  def flashes
    {:partial => '/forms/flashes', :object => flash}
  end
  
  def flash_names
    [:notice, :error, :message, :success]
  end
  
end

# views/forms/_flashes.html.erb
<% for name in flash_names %>
  <% if flash[name] %>
    <%= "<div id=\"#{name}\" class=\"flash-#{name}\">#{flash[name]}</div>" %>
  <% end %>
<% end %>