var ref=location.hash;
var active=null;
if(ref!="") {
	active=document.getElementById(ref.substring(2));
	active.style.display="block";
	}

function show(n) {
	var x=document.getElementById(n);
	if (active!=null) active.style.display="none";
	x.style.display="block";
	active=x; 
	return;
}