function over() {
	for (var i = 0, x = 0; i < this.cells.length; i++, x = i%2) {
		if (x) this.cells[i].className = 'hlt-odd';
		else this.cells[i].className = 'hlt';}
		}
function out() {
	for (var i = 0,  x = 0; i < this.cells.length; i++, x = i%2) {
		if (x) this.cells[i].className = 'odd';
		else this.cells[i].className = '';}
	}