function show_hide(id, show) {
	if (el = document.getElementById(id)) {
		if (null==show) show = el.style.display=='none';
		el.style.display = (show ? '' : 'none');
	}
}

function showorhide(id, toggler) {
	if (document.getElementById(id).style.display == "none") {
		document.getElementById(id).style.display = "block";
		document.getElementById(toggler).innerHTML = "<span>- slide</span>";
	} else {
		document.getElementById(id).style.display = "none";
		document.getElementById(toggler).innerHTML = "<span>+ slide</span>";
	}
}
/* funzione per la disattivazione dello slideshow */
function init() {
	//showorhide('topslide','slide-toggle');
}
// window.onload = init;