<% link_to(root_path, :title => "ホーム") do %>
  <%= theme_image_tag "home_top_tab.gif",
        :alt => "ホーム",
        :onmouseover => "this.src=#{theme_image_path('home_top_tab_2.gif').to_json}",
        :onmouseout => "this.src=#{theme_image_path('home_top_tab.gif').to_json}"
  %>
<% end %>
