var currentEffect = null;

function toggleBackground(obj, highlight) {
	if (obj) {
		if (currentEffect) {
			currentEffect.cancel();
		}
		if(highlight) {
			currentEffect = new Effect.Morph(obj, {
			  style: { background: '#4242FF' },
			  duration: 0.5
			});
		} else {
			obj.style.backgroundColor = "#FFFFFF";
		}
	}
}