function changeG()
    {
        //主題館主Banner
        //圖檔超過1個才執行換圖
        var bkImg = "img/Banner/Default4Promotion2.jpg";//預設
        var AltImg = "";
        if(typeof(arrG_Src)!="undefined")
        {
            if(typeof(arrG_Src[indexG])!="undefined")
            {
                bkImg = arrG_Src[indexG];
            }
        }
        if(typeof(arrG_Alt)!="undefined")
        {
            if(typeof(arrG_Alt[indexG])!="undefined")
            {
                AltImg = arrG_Alt[indexG];
            }
        }
        //document.getElementById("tdG").style.backgroundImage = "url("+bkImg+")";
        //document.getElementById("tdG").style.backgroundRepeat = "no-repeat"; 
        document.getElementById("ImgG").src = bkImg;
        document.getElementById("ImgG").alt = AltImg;
        if(typeof(arrG_Src)!="undefined")
        {
            indexG++;
            if(indexG >= arrG_Src.length)
                indexG = 0;
            if(arrG_Src.length >= 2)
                setTimeout("changeG()",arrG_Duration[indexG]);
        }
    }