function toggleCSS()
{
  var screenCSS = document.getElementById('screenCSS');
  var printCSS = '';
  if (screenCSS.flag == true)
  {
    screenCSS.href = screenCSS.oldhref;
    screenCSS.flag = false;
  }
  else
  {
    screenCSS.oldhref = screenCSS.href;
    screenCSS.href = printCSS.href;
    screenCSS.flag = true;
  }
}

function showDiv(div)
{
  if (document.getElementById(div).style.display == 'none')
  {
    document.getElementById(div).style.display = 'block';
  }
  else
  {
    document.getElementById(div).style.display = 'none';
  }
}