var linkElement = document.getElementsByTagName('link')
for(i = 0; i < linkElement.length; i++) {
	if(linkElement[i].rel == 'alternate stylesheet') {
		linkElement[i].rel = 'stylesheet';
	}
}

window.onload = function() {
	var targetArea = document.getElementById('navigationArea');
	var targetList = targetArea.getElementsByTagName('dl');
	var targetAnchors = targetArea.getElementsByTagName('dt');

	for(i = 0; i < targetAnchors.length; i++) {
		var targetLink = targetAnchors[i].getElementsByTagName('a')[0];
		targetLink.onclick = function() {
			var changeTarget = this.parentNode.parentNode;
			for(j = 0; j < targetList.length; j++) {
				if(changeTarget.id == targetList[j].id) {
					targetList[j].className == 'on' ? targetList[j].className = 'off' : targetList[j].className = 'on';
				} else {
					targetList[j].className = 'off';
				}
			}
		}
	}
}