Mine

document.observe('dom:loaded', function() {  Event.observe($('tablebody'), 'mouseover', tableOverOut);  Event.observe($('tablebody'), 'mouseout', tableOverOut);});function tableOverOut(event) {  var el = event.element();  var tr = $(el).up('tr');  $(tr).childElements().each(function(element, index) {    $(element).toggleClassName('over');  });}