function apple_bind() {
  var areas= document.getElementById('apple').getElementsByTagName('area');
  for (var i= areas.length; i-->0;)
    areas[i].onclick= apple_click;
  apple_set(0);
}

function apple_set(n) {
  var skins= document.getElementById('apple').getElementsByTagName('img');
  for (var i= skins.length; i-->0;)
    skins[i].style.display= (i==n) ? '' : 'none';
}

function apple_click() {
  var skin= parseInt(this.hash.substring(this.hash.length-1));
  apple_set(skin);
  return false;
}

apple_bind();