function HighlightColumn(ColumnNo)
{
  var i;

  for (i = 0; i < 3; i++)
  {
    if (ColumnNo == (i+1))
    {
      document.getElementById("black-out-col-" + (i+1)).style.display = 'none';
      document.getElementById("black-out-text-" + (i+1)).style.color = '#ffffff';
    }
    else
    {
   //   document.getElementById("black-out-col-" + (i+1)).style.display = 'block';
   //   document.getElementById("black-out-text-" + (i+1)).style.color = '#999999';
    }
  }
}
function HighlightAllColumns()
{
  var i;

  for (i = 0; i < 3; i++)
  {
    document.getElementById("black-out-col-" + (i+1)).style.display = 'none';
    document.getElementById("black-out-text-" + (i+1)).style.color = '#ffffff';
  }
}

function DullColumns()
{
  return;
  var i;

  for (i = 0; i < 3; i++)
  {
    document.getElementById("black-out-col-" + (i+1)).style.display = 'block';
    document.getElementById("black-out-text-" + (i+1)).style.color = '#999999';
  }
}