function showOverview(showWhat) {
		for (var i=0; i<4; i++) {
			document.getElementById('video-' + i).style.display = 'none';
			document.getElementById('nav-' + i).src = '../common/images/kohler_video/newnav' + i + '.jpg';
		}
		document.getElementById('video-' + showWhat).style.display = 'block';
		document.getElementById('nav-' + showWhat).src = '../common/images/kohler_video/newnav' + showWhat + '-on.jpg';
	}