// 表示する画像
      var images = ["images/top/key00.jpg",
                    "images/top/key01.jpg",
                    "images/top/key02.jpg",
                    "images/top/key03.jpg",
                    "images/top/key04.jpg"] ;

      var tid = false ;

      // 画像切り替え
      function changeImage(n) {
        //if (tid != false) return ;
        var targentImg = document.getElementById("changing") ;
        document.getElementById("imgspace").style.backgroundImage = 'url('+targentImg.src+')' ;
        document.getElementById("imgspace").style.backgroundRepeat = 'no-repeat' ;
        targentImg.style.filter = 'alpha(opacity=0, type=0)' ;
        targentImg.style.MozOpacity = targentImg.style.opacity = 0 ;
        targentImg.src = images[n] ;
        clearTimeout(tid) ;
        tid = setTimeout("fadeIn(50)", 100) ;
      }

      // フェードイン
      function fadeIn(o) {
        var targentImg = document.getElementById("changing") ;
        targentImg.style.filter = 'alpha(opacity='+o+', type=0)' ;
        targentImg.style.MozOpacity = targentImg.style.opacity = o / 100 ;
        if (o < 100) tid = setTimeout("fadeIn("+(o+10)+")", 100) ;
        else tid = false ;
      }

      onload = function() {
        // 画像先読み
        preloadImages = [] ;
        for (var i = 0; i < images.length; ++i) {
          preloadImages[i] = new Image() ;
          preloadImages[i].src = images[i] ;
        }
      }