function showItem(itemName) {
//	if (!document.getElementById || !document.getElementsByTagName || !document.getAttribute) { return; }
	var galleryItems = document.getElementById('gallery_items').getElementsByTagName('div');
	for (itemCounter = 0; itemCounter < galleryItems.length; itemCounter++) {
		if(galleryItems[itemCounter].getAttribute('id')) {
			galleryItems[itemCounter].style.display = 'none';
		}
	}

	document.getElementById(itemName).style.display = 'block';
}