function changeGrad(cell) {
	if (cell.className == "rwing-greyline") {
		cell.className = "rwing-greyline-over";
	}
	else {
		cell.className = "rwing-greyline";
	}
}

function changeLGrad(cell) {
	if (cell.className == "lwing-greyline") {
		cell.className = "lwing-greyline-over";
	}
	else {
		cell.className = "lwing-greyline";
	}
}