function toggle( targetId )
{
  if (document.getElementById)
  {
     target = document.getElementById( targetId );

     if (target.style.display == "none")
     {
        target.style.display = "";
     }
     else
     {	
        target.style.display = "none";
     }
  }
  else
  {
     alert('Your browser does not support the W3C DOM. Please upgrade');
  }
}