function setup_sitemenu( menu_id ) {
  var menuTimer;
  var curMenu;
  $$('#' + menu_id + ' li').each(
    function( menu ) {
      var submenu = $(menu.id + '-submenu');
      if ( submenu != undefined ) {
        menu.onmouseover = function () {
          if ( menuTimer != undefined ) {
            window.clearTimeout( menuTimer );
            new Element.hide( curMenu );
          }
          new Element.show( submenu );
        }
        menu.onmouseout = function () {
          menuTimer = window.setTimeout(
            function () { new Element.hide( submenu ) },
            200
          );
          curMenu = submenu;
        }
      }
    }
  );
}