/* ロールオーバー */
function smartRollover() {
  if(document.getElementsByTagName) {
    var tags = ["img","input"];
    var len = tags.length;
    for( var i=0; i<len; i++ ) {
      var el = document.getElementsByTagName(tags[i]);
      var len2 = el.length;
      for(var j=0; j<len2; j++) {
        var attr = el[j].getAttribute("src");
        if( attr ) {
          if(el[j].getAttribute("src").match(/_ot\./))
          {
            el[j].onmouseover = function() {
              this.setAttribute("src", this.getAttribute("src").replace("_ot.", "_ov."));
            }
            el[j].onmouseout = function() {
              this.setAttribute("src", this.getAttribute("src").replace("_ov.", "_ot."));
            }
          }
        }
      }
    }
  }
}
if(window.addEventListener) {
  window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
  window.attachEvent("onload", smartRollover);
}


/* Scroll */
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 / 1.2), Math.floor(y / 1.2));

    if (x > 0 || y > 0) {
        window.setTimeout("backToTop()", 25);
    }
}