function showlist(divname){
  closeall();
  document.getElementById(divname).style.visibility = "visible";
	}
	
function closelist(divname){
  document.getElementById(divname).style.visibility = "hidden";
	}

function closeall() {
  document.getElementById("nw-list").style.visibility = "hidden";
  document.getElementById("north-list").style.visibility = "hidden";
  document.getElementById("west-list").style.visibility = "hidden";
  document.getElementById("central-list").style.visibility = "hidden";
  document.getElementById("east-list").style.visibility = "hidden";
  document.getElementById("south-list").style.visibility = "hidden";
  }