// Rollover function

function rollover(imageObj)
{
	var reg = /(.*)_over(.*)/i;

	if (res = reg.exec(imageObj.src)) {
		imageObj.src = res[1]+res[2];
	} else {
		imageObj.src = imageObj.src.replace(/(.*)\.(.*)/, "$1_over.$2");
	}
	return true;
}

function cellColor(cell,color) {
	cell.style.backgroundColor=color;
	return true;
}