function swapVisible(id)
{
  if(document.getElementById(id).className == 'hidden')
  {
    document.getElementById(id).className = '';
  }
  else if(document.getElementById(id).className == '')
  {
    document.getElementById(id).className = 'hidden';
  }
}

function swapToggle(id)
{
  if(document.getElementById(id).src.match("expand") != null)
  {
    document.getElementById(id).src = document.getElementById(id).src.replace("expand", "collapse");
  }
  else if(document.getElementById(id).src.match("collapse") != null)
  {
    document.getElementById(id).src = document.getElementById(id).src.replace("collapse", "expand");
  }
}