function close_metro_info()
{
 var elAct = document.getElementById('active_metro');
 if(elAct.value == "")
 	return;
 var el = document.getElementById(elAct.value);
 if(el == null)
 	return;
 el.style.display = "none";
}

function show_metro_info(id)
{
 close_metro_info();
 var elId = 'mdiv'+id;
 var el = document.getElementById(elId);
 if(el == null)
 {
 	alert("Metro info not found " + elId);
	return;
 }
 el.style.display = "block";
 var elAct = document.getElementById('active_metro');
 elAct.value = elId;
}