function expandSection(id){

var myTitle = document.getElementById('title' + id);
var myContent = document.getElementById('content' + id);

 if(myContent.style.display=="none"){

  myContent.style.display="block";
  myTitle.className="spoiler unfolded";

 } else {

  myContent.style.display="none";
  myTitle.className="spoiler folded";

 } 

}