function showOverlay()
{
	ol = document.getElementById('overlay');
	ol.style.display = 'block';
	nh = document.getElementById('nothere');
	nh.style.display = 'block';
}

function hideOverlay()
{
	nh = document.getElementById('nothere');
	nh.style.display = 'none';
	ol = document.getElementById('overlay');
	ol.style.display = 'none';
}