function showHideLayer(id) {
	div = document.getElementById(id);
	if (div.style.display == 'block')
		div.style.display = 'none';
	else 
		div.style.display = 'block';
}

function showLayer(id) {
	div = document.getElementById(id);
	div.style.display = 'block';
}

function hideLayer(id) {
	div = document.getElementById(id);
	div.style.display = 'none';
}