page.select('.category').each do |cate|
  cate.removeClassName('active').addClassName('inactive')
end

page.select("#category_#{@category.id}").each do |cate|
  cate.removeClassName('inactive').addClassName('active')
end

page[:category_name].
    hide().
    replace_html(@category.name).
    visual_effect(:appear)
page[:category_description].
    hide().
    replace_html(@category.description).
    visual_effect(:appear)