var activeItem = false;

	function okno(adresa) {
		window.open(adresa,"okno","width=300,height=300,resizable=1");
	}

  function submenu(menu_id) {
    var menuItem = document.getElementById('katalogMenuItem_' + menu_id);
    if (menuItem == activeItem) {
      menuItem.className = 'inactiveItem';
      activeItem = false;
    } else {
      if (activeItem) activeItem.className = 'inactiveItem';
      menuItem.className = 'activeItem';
      activeItem = menuItem;
    }
  }