function describe(x) {
	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';

	} else {
		description.style.display = 'block';
	}
}