window.addEvent('domready', function() {

  $$('#menu td').each(function(element,index) {    
    var id = element.get('id');
    if (id != null) {
      if ($(id+'s')) {
        element.addEvent('mouseover', function() {
          $(id+'s').addClass('show');
        });
        element.addEvent('mouseout', function() {
          $(id+'s').removeClass('show');
        });      
      }
    }
    
  });
});