function troca(obj){
	base = document.getElementById("trocaEspe").getElementsByTagName("div")
	for(i=0;i<base.length;i++){
		base[i].style.display="none";
	}
	document.getElementById(obj).style.display = "block";
}

function bloco(obj){
	base = document.getElementById("mostraBloco").getElementsByTagName("div")
	for(i=0;i<base.length;i++){
		base[i].style.display="none";
	}
	document.getElementById(obj).style.display = "block";
}