function expand(obj) {
  tutobj = document.getElementById("tutorials");
  refobj = document.getElementById("reference");
  if (obj) { if (tutobj.style.display == "none") tutobj.style.display = "block"; else tutobj.style.display = "none"; }
  else { if (refobj.style.display == "none") refobj.style.display = "block"; else refobj.style.display = "none"; }
}
function init() {
  tutobj = document.getElementById("tutorials");
  refobj = document.getElementById("reference");
  tutobj.style.display = "none";
  refobj.style.display = "none";
}
onload = init;