function show(d) {
  document.getElementById('about').style.display = "none";
  document.getElementById('tutoring').style.display = "none";
  document.getElementById('searchgrad').style.display = "none";
  document.getElementById('scholarships').style.display = "none";
  document.getElementById('summerres').style.display = "none";
  document.getElementById('jobopp').style.display = "none";
  document.getElementById('volopp').style.display = "none";
  document.getElementById('oldnews').style.display = "none";
  document.getElementById('tuttab').style.visibility = "hidden";
  document.getElementById('gratab').style.visibility = "hidden";
  document.getElementById('schtab').style.visibility = "hidden";
  document.getElementById('sumtab').style.visibility = "hidden";
  document.getElementById('jobtab').style.visibility = "hidden";
  document.getElementById('voltab').style.visibility = "hidden";
  document.getElementById('oldtab').style.visibility = "hidden";
  switch (d)
  {
  case "tutoring": e="tuttab"; break;
  case "searchgrad": e="gratab"; break;
  case "scholarships": e="schtab"; break;
  case "summerres": e="sumtab"; break;
  case "jobopp": e="jobtab"; break;
  case "volopp": e="voltab"; break;
  case "oldnews": e="oldtab"; break;
  default: e="tuttab";
  }
  document.getElementById(d).style.display = "block";
  document.getElementById(e).style.visibility = "visible";
}