function VisibleDivBlock( divId, status )
{
  if(status == true)
  {
    document.getElementById(divId).style.display = 'block';
  }
  else
  {
    document.getElementById(divId).style.display = 'none';
  }
}

function SwitchDivBlocks( divIdShow, divIdHide )
{
  VisibleDivBlock( divIdShow, true );
  VisibleDivBlock( divIdHide, false );
}