/*
This file provides folding of sections of text
*/
var toggleHidden = function(arrow, target) {
  if (target.style.display == "none") {
    target.style.display = "block";
    arrow.className = "arrow_open";
  } else {
    target.style.display = "none";
    arrow.className = "arrow";
  }
};
var createFolds = function() {
  var context = document.getElementById("content");
  foldHeader(context, "H2");
};

var foldHeader = function(context, type) {
  if (!context.hasChildNodes()) return;
  var child = context.firstChild;
  var prev_child = child;
  var header = null;
  var section = null;
  var open = 0;

  while (child) {
    var next_child = child.nextSibling;
    if (child.nodeName == type) {
      if (section == null) {
        header = child;
        var arrow = document.createElement("div");
        arrow.className = "arrow_open";
        header.appendChild(arrow);
        section = document.createElement("div");
        header.onclick = (function(header, arrow, section) {
          return function(e) {
            toggleHidden(arrow, section);
          }
        })(header, arrow, section);
        toggleHidden(arrow, section);
        open = 1;
      } else {
        if (header.nextSibling) {
          context.insertBefore(section, header.nextSibling);
        } else {
          context.appendChild(section);
        }
        header = child;
        var arrow = document.createElement("div");
        arrow.className = "arrow_open";
        header.appendChild(arrow);
        section = document.createElement("div");
        header.onclick = (function(header, arrow, section) {
          return function(e) {
            toggleHidden(arrow, section);
          }
        })(header, arrow, section);
        toggleHidden(arrow, section);
        open = 1;
      }
    } else {
      if (section != null) {
        section.appendChild(child);
      }
    }
    prev_child = child;
    child = next_child;
  }
  if (open == 1) {
    if (header.nextSibling) {
      context.insertBefore(section, header.nextSibling);
    } else {
      context.appendChild(section);
    }
  }

};
window.onload = function() { createFolds() };