function makeIndex() {
  if ( !document.all ) {
    if ( !document.getElementsByTagName('*') ){
// 参考: http://q.hatena.ne.jp/1124773824
      return;
    }
  }
  var str = ' ';
  for (var i = 0; i < document.anchors.length; i++) {
    var a = document.anchors[i];
    for (j = 0; j < innerText_AnyBrowser(a).length ; j++) {
      if (innerText_AnyBrowser(a).charAt(innerText_AnyBrowser(a).length - j - 1) != '　') {
        break;
      }
    }
    if (j > 0) {
      for (k = 1; k < j; k++) {
        str += "　　";
      }
      if (j==1) {
        str += "■";
      } else if (j==2) {
        str += "●";
      } else if (j==3) {
        str += "○";
      } else if (j==4) {
        str += "<b>・</b>";
      } else if (j==5) {
        str += "<b>-</b> ";
      }

      str += "<a href='" + document.location.pathname
          + "#" + a.name + "' target=\"_self\">" 
          + innerText_AnyBrowser(a).substring(0, innerText_AnyBrowser(a).length - j) 
          + "</a><br>";
    }
  }
  $('Contents').innerHTML = str;
}


function innerText_AnyBrowser(a){
// ブラウザ判定
// 参考: http://filipo.cocolog-nifty.com/blog/2007/05/firefoxinnertex_916a.html
  if (typeof a.textContent != "undefined") {
    return (a.textContent);
  } else {
    return (a.innerText);
  }
}


function $(tagId) {
  return document.getElementById(tagId);
}