function mostra(item)
{
	for(c = 1; c <= 18; c++)
		document.getElementById("r" + c).style.display = "none";
		
		document.getElementById(item).style.display = "";
}
function fechar()
{
	for(c = 1; c <= 18; c++)
		document.getElementById("r" + c).style.display = "none";
}