function expandCollapse(ElementId,E1,E2,U1,U2)
{
   for (i = E1; i <= E2; ++i)
   {
      var theElement = document.getElementById(i);
      theElement.style.display = 'none';
   }

   for (i = U1; i <= U2; ++i)
   {
      var theElement = document.getElementById(i);
      theElement.style.display = 'none';
   }

   var theElement = document.getElementById(ElementId);
   theElement.style.display = (theElement.style.display == 'none') ? 'block' : 'none';
}