var previousLayerName = 'timeline';
	
	function ShowText(nextLayerName) {
		var previousLayer = getLayer('timeline_' + previousLayerName);
		var nextLayer = getLayer('timeline_' + nextLayerName);
		if (previousLayer && nextLayer) {
			previousLayer.style.display = 'none';
			nextLayer.style.display = 'block';
			previousLayerName = nextLayerName;
		}
	}