function makeactive(dtid){
	dt = document.getElementById(dtid);
	var dd = document.getElementById(dtid+"dd");
	var dl = dt.parentNode;
	titles = dl.getElementsByTagName("dt");
	for (var i=0; i < titles.length; i++) {
		title = titles[i];
		ddtitle = title.id+"dd";
		desc = document.getElementById(ddtitle);
        desc.style.display= 'none';
        title.className="";
	}
    dd.style.display= 'block';
    dt.className = "open";
}