function teste(div){
  if(document.getElementById(div).style.display == "block"){
    document.getElementById(div).style.display = "none";
    document.getElementById(div).style.visibility="hidden";
  }
  else{
    document.getElementById(div).style.display = "block";
    document.getElementById(div).style.visibility="visible";
    parent.document.getElementById("iframe_corpo").height = document.getElementById("tamanho").scrollHeight +150;
  }
}