Event.observe(window,'load',function(e){Behaviour.go();});
function toggle_visibility(id) {
  var e = document.getElementById(id);
  var top = document.getElementById("toggle_"+id);
  if(e.style.display == 'block') {
    e.style.display = 'none';
    top.innerHTML = top.innerHTML.replace("-", "+");
  } else {
    e.style.display = 'block';
    top.innerHTML = top.innerHTML.replace("+", "-");
  }
}