var activatedId = 0;
function activate(id) {
	if (activatedId==id) return false;
	var newLink = document.getElementById('hl'+id);
	if (newLink != null) {
		if (activatedId>0) {
			var oldLink = document.getElementById('hl'+activatedId);
			oldLink.setAttribute("class", "");
			oldLink.className="";
			var oldContainer = document.getElementById('el'+activatedId);
			oldContainer.style["display"]="none";
		}
		newLink.setAttribute("class", "active");
		newLink.className="active";	
		var newContainer = document.getElementById('el'+id);
		newContainer.style["display"]="block";
		activatedId = id;
	}
}