var lastOpened = null;

function toggle (objecto) {
	
	if (document.getElementById(objecto).style.display == 'none') {
		if (lastOpened != null) {
			document.getElementById(lastOpened).style.display = 'none';
		}
		document.getElementById(objecto).style.display = 'block';
		lastOpened = objecto;
	}
	else {
		document.getElementById(objecto).style.display = 'none';
	}
	
}