// FontChanger
// Copyright (c) 2007 Hirotaka Ogawa
// REQUIRES: prototype.js, cookiemanager.js
FontChanger = Class.create();
FontChanger.prototype = {
  id: null,
  cookieManager: null,
  cookieName: 'body.style.fontSize',
  initialize: function(id) {
    this.id = id || 'fontChanger';
    this.cookieManager = new CookieManager();
    var fontSize = this.cookieManager.getCookie(this.cookieName);
    if (fontSize) document.body.style.fontSize = fontSize;
  },
  setCookieShelfLife: function(days) {
    this.cookieManager.cookieShelfLife = days;
  },
  change: function(fontSize) {
    document.body.style.fontSize = fontSize;
    this.cookieManager.setCookie(this.cookieName, fontSize);
  },
  reset: function() {
    document.body.style.fontSize = '';
    this.cookieManager.clearCookie(this.cookieName);
  },
  show: function() {
    var id = this.id;
    document.writeln([
'<p id="' + id + '">',
'<div class="fontsize">',
'<img src="http://sv103.wadax.ne.jp/~eco-joetsu-niigata-jp/image/fontsize-title.gif" alt="文字の大きさ:" width="86" height="22" class="fontsize-title" />',
'<ul>',
'<li class="fontsize01"><a href="javascript: void(0);" id="' + id + '-small" title="文字を小さくする"><span>小</span></a></li>',
'<li class="fontsize02"><a href="javascript: void(0);" id="' + id + '-medium" title="文字を標準に戻す"><span>中</span></a></li>',
'<li class="fontsize03"><a href="javascript: void(0);" id="' + id + '-large" title="文字を大きくする"><span>大</span></a></li>',
'</ul>',
'</div>',
'</p>'
    ].join("\n"));
    Event.observe($(id + '-small' ), 'click', this.onClickSmall.bind(this));
    Event.observe($(id + '-medium'), 'click', this.onClickMedium.bind(this));
    Event.observe($(id + '-large' ), 'click', this.onClickLarge.bind(this));
  },
  onClickSmall:  function(e) { this.change('70%' ); },
  onClickMedium: function(e) { this.reset(); },
  onClickLarge:  function(e) { this.change('100%'); }
};
// Bootstrap
FontChanger.start = function(id) {
  var fontChanger = new FontChanger(id);
  fontChanger.show();
};