function toggleDiv(divName)
{
  thisDiv = document.getElementById(divName);
  if (thisDiv)
  {
    if (thisDiv.style.display == "none") 
	{
      thisDiv.style.display = "block";
    }
	else
	{
      thisDiv.style.display = "none";
    }
  }
  else {
    alert("Error: Could not locate div with id: " + divName);
  }
}