// JavaScript Document
function nOn (n) {
  	var f = document.getElementById('nOff'+n);
  	var g = document.getElementById('nOn'+n);
  	f.style.display = 'none';
  	g.style.display = 'block';
  }
  function nOff (n) {
  	var f = document.getElementById('nOff'+n);
  	var g = document.getElementById('nOn'+n);
  	g.style.display = 'none';
  	f.style.display = 'block';
  }