/*----------------------------------------------------*/
/*      スタイルシートを切り換える                    */
/*                                                    */
/* 【原作】  A List Apart (styleswitcher.js )         */
/* 【作者】  Paul Sowden                              */
/*                                                    */
/*  改造点                    2006.8.4   M.Kojima     */
/*    ・複数条件での切り替え                          */
/*    ・Shortcut機能 (おまけ）                          */
/*----------------------------------------------------*/

function getActiveStyleSheet(option) {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")
        && a.getAttribute("title").indexOf(option) == 0
        && !a.disabled
    ) return a.getAttribute("title");
  }
  return null;
}

function resetActiveStyleSheet() {
	setActiveStyleSheet('size','size_0')
	setActiveStyleSheet('color','color_0')
}

function setActiveStyleSheet(option, title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")
        && a.getAttribute("title").indexOf(option) == 0
    ) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getPreferredStyleSheet(option) {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("rel").indexOf("alt") == -1
        && a.getAttribute("title")
        && a.getAttribute("title").indexOf(option) == 0
    ) return a.getAttribute("title");
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style_size");
  var title = cookie ? cookie : getPreferredStyleSheet('size');
  setActiveStyleSheet('size',title);
  var cookie = readCookie("style_color");
  var title = cookie ? cookie : getPreferredStyleSheet('color');
  setActiveStyleSheet('color',title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet('size');
  createCookie("style_size", title, 365);
  var title = getActiveStyleSheet('color');
  createCookie("style_color", title, 365);
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onunload = function(e) {
  var title = getActiveStyleSheet('size');
  createCookie("style_size", title, 365);
  var title = getActiveStyleSheet('color');
  createCookie("style_color", title, 365);
}

function setShortcut() {
  result = confirm("このページをショートカット登録すると、\nトップページから、ここにジャンプできます。");
  if (result) createCookie("cookie_shortcut_1", location, 365); 
}

function linkShortcut(msg) {
  var cookie = readCookie("cookie_shortcut_1");
  var link = cookie ? '<a href="'+ cookie + '">'+msg+'</a>' : '';
  document.write(link);
}

var cookie = readCookie("style_size");
var title = cookie ? cookie : getPreferredStyleSheet('size');
setActiveStyleSheet('size', title);
var cookie = readCookie("style_color");
var title = cookie ? cookie : getPreferredStyleSheet('color');
setActiveStyleSheet('color', title);