function showhide(win) {
	name = prendiElementoDaId(win);
	if (name.style.display == "block") {
		name.style.display="none";
	} else {
		name.style.display="block";
	}
}

function prendiElementoDaId(id_elemento) {      //CrossBrowser
	return (document.getElementById) ? document.getElementById(id_elemento) : document.all[id_elemento];
}