function showCat(catId) {
	hideAll(6);
	document.getElementById('cat' + catId).style.display = 'block';

}

function hideAll(number) {
	for (var i = 1; i <= number; i++) {
		document.getElementById('cat' + i).style.display = 'none';
	}
}

function showPhoto(src, title, descr) {
		document.getElementById('photoViewer').innerHTML = "<img src=\""+src+"\"/>";
		document.getElementById('title').innerHTML = title;
		document.getElementById('descr').innerHTML = descr;
}