function update_frames() {
  if (parent.frames['top_menu']) {
    menu_page = parent.frames['top_menu'].location
    new_menu = menubase + top_menu_page
    if (menu_page.href.indexOf(new_menu) == -1) {
      if (document.images) {
        menu_page.replace(path_modifier + new_menu)
      }
      else {
        menu_page = path_modifier + new_menu
      }
    }
  }
  if (parent.frames['sub_menu']) {
    menu_page = parent.frames['sub_menu'].location
    new_menu = menubase + sub_menu_page
    if (menu_page.href.indexOf(new_menu) == -1) {
      if (document.images) {
        menu_page.replace(path_modifier + new_menu)
      }
      else {
        menu_page = path_modifier + new_menu
      }
    }
  }
}

menubase = "menus/"
update_frames()