function openAll() {
	var elems = document.getElementsByTagName("details");
	document.getElementById("btnExpandHideAllDetails").innerHTML = "Collapse All";
	document.getElementById("btnExpandHideAllDetails").setAttribute( "onClick", "javascript: closeAll();");
  
	for (var i = 0; i < elems.length; i++){
	  elems[i].setAttribute("open", "true");
	  }
  }
  
  function closeAll() {	
	var elems = document.getElementsByTagName("details");
	document.getElementById("btnExpandHideAllDetails").setAttribute( "onClick", "javascript: openAll();" );
	document.getElementById("btnExpandHideAllDetails").innerHTML = "Expand All";	
	
	for (var i = 0; i < elems.length; i++){
	  elems[i].removeAttribute("open");
	}
  }