function toggleDisplay(id)
{
   obj = document.getElementById(id);
   dfobj = document.getElementById('df');

   if (obj.style.display == "none")
   {
      obj.style.display = "";
   }
   else
   {
      obj.style.display = "none";
   }
}

function displayOff(id)
{
   obj = document.getElementById(id);
   obj.style.display = "none";
}

function displayOn(id)
{
   obj = document.getElementById(id);
   obj.style.display = "";
}

function displayDFSame(id)
{
   obj = document.getElementById(id);
   dfobj = document.getElementById('df');
   dfobj.style.display = obj.style.display;
}


function displayDFOpposite(id)
{
   obj = document.getElementById(id);
   dfobj = document.getElementById('df');
   if (obj.style.display == "none")
   {
      dfobj.style.display = "";
   }
   else
   {
      dfobj.style.display = "none";
   }
}

function hmmouseover ()
{
  displayOff('wb');
  displayOff('mt');
  displayOff('dp');
  displayOff('tn');
  document.images.wbarrow.src='TMCimages/Blank-arrow.gif';
  document.images.mtarrow.src='TMCimages/Blank-arrow.gif';
  document.images.dparrow.src='TMCimages/Blank-arrow.gif';
  document.images.tnarrow.src='TMCimages/Blank-arrow.gif';
  displayOn('df');
  return true;
}

function webmouseover ()
{
  displayOff('mt');
  displayOff('dp');
  displayOff('tn');
  document.images.mtarrow.src='TMCimages/Blank-arrow.gif';
  document.images.dparrow.src='TMCimages/Blank-arrow.gif';
  document.images.tnarrow.src='TMCimages/Blank-arrow.gif';
  wbobj = document.getElementById('wb');
  if (wbobj.style.display=="none")
  {
    document.images.wbarrow.src='TMCimages/Gradient-arrow.gif';
    displayDFSame('wb');
    displayOn('wb');
  }
  return true;
}

function mtmouseover ()
{
  displayOff('wb');
  displayOff('dp');
  displayOff('tn');
  document.images.wbarrow.src='TMCimages/Blank-arrow.gif';
  document.images.dparrow.src='TMCimages/Blank-arrow.gif';
  document.images.tnarrow.src='TMCimages/Blank-arrow.gif';
  mtobj = document.getElementById('mt');
  if (mtobj.style.display=="none")
  {
    document.images.mtarrow.src='TMCimages/Gradient-arrow.gif';
    displayDFSame('mt');
    displayOn('mt');
  }
  return true;
}

function dpmouseover ()
{
  displayOff('wb');
  displayOff('mt');
  displayOff('tn');
  document.images.wbarrow.src='TMCimages/Blank-arrow.gif';
  document.images.mtarrow.src='TMCimages/Blank-arrow.gif';
  document.images.tnarrow.src='TMCimages/Blank-arrow.gif';
  dpobj = document.getElementById('dp');
  if (dpobj.style.display=="none")
  {
    document.images.dparrow.src='TMCimages/Gradient-arrow.gif';
    displayDFSame('dp');
    displayOn('dp');
  }
  return true;

}

function tnmouseover ()
{
  displayOff('wb');
  displayOff('mt');
  displayOff('dp');
  document.images.wbarrow.src='TMCimages/Blank-arrow.gif';
  document.images.mtarrow.src='TMCimages/Blank-arrow.gif';
  document.images.dparrow.src='TMCimages/Blank-arrow.gif';
  tnobj = document.getElementById('tn');
  if (tnobj.style.display=="none")
  {
    document.images.tnarrow.src='TMCimages/Gradient-arrow.gif';
    displayDFSame('tn');
    displayOn('tn');
  }
  else
  {
  }
  return true;

}

function cumouseover ()
{
  displayOff('wb');
  displayOff('mt');
  displayOff('dp');
  displayOff('tn');
  document.images.wbarrow.src='TMCimages/Blank-arrow.gif';
  document.images.mtarrow.src='TMCimages/Blank-arrow.gif';
  document.images.dparrow.src='TMCimages/Blank-arrow.gif';
  document.images.tnarrow.src='TMCimages/Blank-arrow.gif';
  displayOn('df');
  return true;
}