function show(id, cntl)
{
   el = document.getElementById(id);
   cntl = document.getElementById(cntl);
   if (el.style.display == 'none')
   {
      el.style.display = '';
      cntl.innerHTML = "<a href=# onClick=show('text','link');><img src=gfx/button_negative.gif width=18 height=18  alt=Hide border=0 /></a>";
   } else {
      el.style.display = 'none';
      cntl.innerHTML = "<a href=# onClick=show('text','link');><img src=gfx/button_plus.gif width=18 height=18  alt=Show border=0 /></a>";
   }
}