function show(el, val) {
		var layer = document.getElementById('r' + val).style.display;
		
		if (layer == 'none') {
			document.getElementById('r' + val).style.display = 'block';
			el.style.background = "url('/images/arrow-up.png') no-repeat top right";
		} else {
			document.getElementById('r' + val).style.display = 'none';
			el.style.background = "url('/images/arrow-down.png') no-repeat bottom right";
		}
	}