function showDetail(id) {
	document.getElementById(id).parentNode.parentNode.style.visibility = "visible";
}

function hideDetail(id) {
	document.getElementById(id).parentNode.parentNode.style.visibility = "hidden";
}

function showPrev(id) {
	var curr = id+1;
	hideDetail('img_'+curr);
	showDetail('img_'+id);
}

function showNext(id) {
	var curr = id-1;
	hideDetail('img_'+curr);
	showDetail('img_'+id);
}