//ページトップへ　スクロール

function scr_Up() {

   if(window.pageYOffset == undefined){
      scr_top = document.documentElement.scrollTop;
   } else {
      scr_top = window.pageYOffset;
   }
   if(scr_top){
      scr_now = Math.ceil(scr_top*.15);
      scrollBy(0,-scr_now);
      if (scr_top-scr_now) setTimeout("scr_Up()",0);
   }
}