<% link_to(messages_path, :accesskey => '2', :title => "メッセージ") do %>
    <%= theme_image_tag "my_menu_message.gif", :id => "my_menu_message",
        :alt => "メッセージ",
        :onmouseover => "$('my_menu_message').src=#{theme_image_path('my_menu_message_ov.gif').to_json}",
        :onmouseout => "$('my_menu_message').src=#{theme_image_path('my_menu_message.gif').to_json}"
    %>
<% end %>
