function showLayer(id)
{
	el = document.getElementById(id);
	if (!el)
		return;

	if (!el.style)
		el.style = el;

	el.style.visibility = 'visible';
	el.style.display = 'block';
}

function hideLayer(id)
{
	el = document.getElementById(id);
	if (!el)
		return;

	if (!el.style)
		el.style = el;

	el.style.visibility = 'hidden';
	el.style.display = 'none';
}