// Show given feedback element and hide all others.
function ShowFeedback(current, total)
{
  for(i = 1; i <= total; i++)
  {
    element = document.getElementById('feedback'+i);
    if(i == current)
    {
      element.style.display = 'block';
    }
    else
    {
      element.style.display = 'none';
    }
  }
}