function ShowHide(div,image) {
  var thisLevel = document.getElementById(div);
  var thisImage = document.getElementById(image);

  if (thisLevel.style.display == "none"){
      thisLevel.style.display = "block";
      thisImage.src = "/gfx/min.jpg";
  }
  else{
    var thisLevel = document.getElementById(div);
    thisLevel.style.display = "none";
    thisImage.src = "/gfx/plus.jpg";
  }
}