(function () {
  var onload = function (e) {
    for (var i = 0; i < document.images.length; ++i) {
      if (document.images[i].src.match(/^(.*)_\.([^.]*)$/)) {
        (function (img, pre, ext) {
          var active = new Image(); active.src = pre + '_o.' + ext;
          var normal = new Image(); normal.src = pre + '_.' + ext;
          var onmouseover = function (e) { img.src = active.src; }
          var onmouseout = function (e) { img.src = normal.src; }
          try {
            img.addEventListener('mouseover', onmouseover, false);
            img.addEventListener('mouseout', onmouseout, false);
          }
          catch (e) {
            img.attachEvent('onmouseover', onmouseover);
            img.attachEvent('onmouseout', onmouseout);
          }
        })(document.images[i], RegExp.$1, RegExp.$2);
      }
    }
  }
  try {
    window.addEventListener('load', onload, false);
  }
  catch (e) {
    window.attachEvent('onload', onload);
  }
})()


//////////////////////////////////////////////////////////////////////////
//
// スクロールしてページトップにもどる
//
//////////////////////////////////////////////////////////////////////////


function backToTop() {
  var x1 = x2 = x3 = 0;
  var y1 = y2 = y3 = 0;
  if (document.documentElement) {
      x1 = document.documentElement.scrollLeft || 0;
      y1 = document.documentElement.scrollTop || 0;
  }
  if (document.body) {
      x2 = document.body.scrollLeft || 0;
      y2 = document.body.scrollTop || 0;
  }
  x3 = window.scrollX || 0;
  y3 = window.scrollY || 0;
  var x = Math.max(x1, Math.max(x2, x3));
  var y = Math.max(y1, Math.max(y2, y3));
  window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  if (x > 0 || y > 0) {
      window.setTimeout("backToTop()", 25);
  }
}