/**** SHOW / HIDE DIVS ******/
	function showHide(layerid)
	{
		for (var l = 1; l <= 21; l++) {
			document.getElementById('image' + l).style.visibility = 'hidden';	
		}
		document.getElementById(layerid).style.visibility = 'visible';	
	}
	function showAll()
	{
		for (var l = 1; l <= 21; l++) {
			document.getElementById('image' + l).style.visibility = 'visible';	
		}
	
	}