function auto()
{ 
  document.getElementById('auto').style.display = "block";
  document.getElementById('auto02').style.display = "none";
  document.getElementById('auto03').style.display = "none";
  document.getElementById('twee').className= "selected";
  document.getElementById('een').className= "none";
  document.getElementById('drie').className= "none";
  return false;
}

function auto01()
{ 
  document.getElementById('auto').style.display = "none";
  document.getElementById('auto03').style.display = "none";
  document.getElementById('auto02').style.display = "block";
  document.getElementById('een').className= "selected";
  document.getElementById('twee').className= "none";
  document.getElementById('drie').className= "none";
  return false;
}

function auto03()
{ 
  document.getElementById('auto').style.display = "none";
  document.getElementById('auto02').style.display = "none";
  document.getElementById('auto03').style.display = "block";
  document.getElementById('een').className= "none";
  document.getElementById('twee').className= "none";
  document.getElementById('drie').className= "selected";
  return false;
}