paster

function hlRows(){
	var cells = $$('tbody.hl td')

	for (var i=0; i < cells.length; i++)
	{
		cells[i].onmouseover = function () {
			this.up().addClassName('hl');
		}
		cells[i].onmouseout = function () {
			this.up().removeClassName('hl');
		}
	}
}


css
---
tr.hl td {
	background-color: #ffa;
}