è fatto così
codice:
function describe(x) {
	var firstCell = x.parentNode.parentNode.childNodes[0];
	var secondCell = x.parentNode.parentNode.childNodes[1];
	if (!x.parentNode.parentNode.childNodes[0].className) {
		firstCell = x.parentNode.parentNode.childNodes[1];
		secondCell = x.parentNode.parentNode.childNodes[3];
	}
	var description;
	for (i = 0; i < x.parentNode.childNodes.length; i++) {
		if (x.parentNode.childNodes[i].className == "sessiondescription") {
			description = x.parentNode.childNodes[i];
			break;
		}
	}
	if (description.style.display == 'block') {
		description.style.display = 'none';
		x.parentNode.parentNode.style.backgroundColor = "#fff";
		firstCell.className = 'start';
		secondCell.className = 'end';

	} else {
		description.style.display = 'block';
		x.parentNode.parentNode.style.backgroundColor = "#f9f9f9";
		categoryColor = description.childNodes[description.childNodes.length - 1].className;
		firstCell.className = categoryColor;
		firstCell.style.color = '#000';
		secondCell.className = categoryColor;
		secondCell.style.color = '#000';
	}
}
e richiamato così
codice:
TestoLink
la classe css .ws te la cerchi o te la fai come meglio credi

ad ogni modo il css esterno è qui
http://www.apple.com/retail/css/retail2.css