function expandCollapse(ElementId,K1d,V1d,K2d,V2d)
{
   for (i = K1d; i <= V1d; ++i)
   {
      var theElement = document.getElementById(i);
      theElement.style.display = 'none';
   }
   
   var theElement = document.getElementById(ElementId);
   theElement.style.display = (theElement.style.display == 'none') ? 'block' : 'none';
   
   for (i = K2d; i <= V2d; ++i)
   {
      var theElement = document.getElementById(i);
      theElement.style.display = 'none';
   }   
}