/* 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);
    }
}