function findScrollTop()
{
  if(window.pageYOffset != null) return window.pageYOffset;
  if(document.body.scrollWidth != null) return document.body.scrollTop;
  return (null);
}

function moveMenuBar()
{
  var floatyMenu = document.getElementById('navSub');
  var y = findScrollTop();
  if(y < 200) y = 200;
  floatyMenu.style.display = 'none';
  floatyMenu.style.top = y + 'px';
  floatyMenu.style.display = 'block';
}