<script type='text/javascript'>
function Switchable(classname) {
function getElementsByClassName(imgclass) {
  if ( document.getElementsByClassName ) {
  return document.getElementsByClassName(imgclass);
  } else {
  var nodes = document.getElementsByTagName('*'),
  tmp = [];
  for ( var i = 0; i < nodes.length; i++ ) {
  if ( new RegExp('\\b' + imgclass + '\\b').test(nodes[i].className) ) {
  tmp.push(nodes[i]);
  }
  }
  return tmp;
  }
}

function Next(element) {
  var next = element;
  while (next = next.nextSibling)
  if ("innerHTML" in next)
  return next;
  return element;
}

function getCookie(a){var b=document.cookie.match(new RegExp("(?:^|; )"+a.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g,"\\$1")+"=([^;]*)"));returnb?decodeURIComponent(b[1]):undefined}function setCookie(b,f,c){c=c||{};var i=c.expires;if(typeof i=="number"&&i){var h=newDate();h.setTime(h.getTime()+i*1000);i=c.expires=h}if(i&&i.toUTCString){c.expires=i.toUTCString()}f=encodeURIComponent(f);vara=b+"="+f;for(var e in c){a+="; "+e;var g=c[e];if(g!==true){a+="="+g}}document.cookie=a}
  var nodes = getElementsByClassName(classname);
  for (var i = 0; i < nodes.length; i++) {
  var toggler = document.createElement("A");
  toggler.href = "javascript://";
  toggler.id = "toggler" + i;
  toggler.innerHTML = getCookie("toggler" + i) == "hide" ? "+" : "-";
  toggler.onclick = function () {
  Next(this.parentNode).style.display = getCookie(this.id) == "hide" ? "" : "none";
  setCookie(this.id, getCookie(this.id) == "hide" ? "show" : "hide", {
  expires: new Date("01 Jan 2020")
  });
  this.innerHTML = getCookie(this.id) == "hide" ? "+" : "-";
  };
  Next(nodes[i]).style.display = getCookie("toggler" + i) == "hide" ? "none" : "";
  nodes[i].appendChild(toggler);
  }
}

Switchable("header");
</script>