// JavaScript Document
function toggleExpansion(result,btn) {
   obj = document.getElementById(result);
   button = document.getElementById(btn);
   visible=(obj.style.display != "none");

   if (visible) {
     	obj.style.display = "none";
	 button.className = "btn_expand";
   } else {
     	obj.style.display = "block";
	 button.className = "btn_collapse";
   }
}