循環顯示圖片

//循環顯示圖片----------------------------------------------------------------
<script language="JavaScript">
                var NowFrame = 1; //定義當前圖片
    var MaxFrame = 3; //定義圖片張數
    function show() {
    var next = NowFrame + 1;
    if(next == MaxFrame+1)
    {
       NowFrame = MaxFrame;
       next = 1;
    }
    {
       document.getElementById('div'+next).style.display = "block";
       document.getElementById('div'+NowFrame).style.display = "none"; 
       if(NowFrame == MaxFrame)
     NowFrame = 1;         //當前圖序列號最大時，設當前圖序號爲1，重新開始輪換顯示
       else
     NowFrame++;
    }
     setTimeout('show()', 2000);
    }
</script>