function swap_spoiler_states(obj) {
	var div= obj.getElementsByTagName('div');
	if (div[0]) {
		if (div[0].style.visibility == "visible") {
			div[0].style.visibility= 'hidden';
		} else if (div[0].style.visibility == "hidden" || !div[0].style.visibility) {
			div[0].style.visibility= 'visible';
		}
	}
}