var version = (navigator.appVersion.charAt(0) == "4") ||
                ((navigator.appVersion.charAt(0) == "3") &&
                    (navigator.appName == "Netscape"));
if (version) {

    img1Up = new Image();
    img1Up.src = "img/00.gif"; // クリックを止めた時
    img1Down = new Image();
    img1Down.src = "img/00.gif"; //クリック時
    img1Over = new Image();
    img1Over.src = "img/00.gif"; // マウスを乗せたとき
    img1Out = new Image();
    img1Out.src = "img/10.gif"; // マウスを離した時

    img2Up = new Image();
    img2Up.src = "img/01.gif";
    img2Down = new Image();
    img2Down.src = "img/01.gif";
    img2Over = new Image();
    img2Over.src = "img/01.gif";
    img2Out = new Image();
    img2Out.src = "img/11.gif";

    img3Up = new Image();
    img3Up.src = "img/02.gif";
    img3Down = new Image();
    img3Down.src = "img/02.gif";
    img3Over = new Image();
    img3Over.src = "img/02.gif";
    img3Out = new Image();
    img3Out.src = "img/12.gif";

    img4Up = new Image();
    img4Up.src = "img/03.gif";
    img4Down = new Image();
    img4Down.src = "img/03.gif";
    img4Over = new Image();
    img4Over.src = "img/03.gif";
    img4Out = new Image();
    img4Out.src = "img/13.gif";

    img5Up = new Image();
    img5Up.src = "img/top15.jpg";
    img5Down = new Image();
    img5Down.src = "img/top15.jpg";
    img5Over = new Image();
    img5Over.src = "img/top15.jpg";
    img5Out = new Image();
    img5Out.src = "img/top5.jpg";

    img6Up = new Image();
    img6Up.src = "img/top02_2.gif";
    img6Down = new Image();
    img6Down.src = "img/top02_2.gif";
    img6Over = new Image();
    img6Over.src = "img/top02_2.gif";
    img6Out = new Image();
    img6Out.src = "img/top02.gif";

    img7Up = new Image();
    img7Up.src = "img/menu_u1+.jpg";
    img7Down = new Image();
    img7Down.src = "img/menu_u1+.jpg";
    img7Over = new Image();
    img7Over.src = "img/menu_u1+.jpg";
    img7Out = new Image();
    img7Out.src = "img/menu_u1.jpg";

    img8Up = new Image();
    img8Up.src = "img/menu_u2+.jpg";
    img8Down = new Image();
    img8Down.src = "img/menu_u2+.jpg";
    img8Over = new Image();
    img8Over.src = "img/menu_u2+.jpg";
    img8Out = new Image();
    img8Out.src = "img/menu_u2.jpg";

    img9Up = new Image();
    img9Up.src = "img/menu_u3+.jpg";
    img9Down = new Image();
    img9Down.src = "img/menu_u3+.jpg";
    img9Over = new Image();
    img9Over.src = "img/menu_u3+.jpg";
    img9Out = new Image();
    img9Out.src = "img/menu_u3.jpg";

    img10Up = new Image();
    img10Up.src = "img/menu_u4+.jpg";
    img10Down = new Image();
    img10Down.src = "img/menu_u4+.jpg";
    img10Over = new Image();
    img10Over.src = "img/menu_u4+.jpg";
    img10Out = new Image();
    img10Out.src = "img/menu_u4.jpg";


    img11Up = new Image();
    img11Up.src = "img/door/3.gif"; // クリックを止めた時
    img11Down = new Image();
    img11Down.src = "img/door/3.gif"; //クリック時
    img11Over = new Image();
    img11Over.src = "img/door/2.gif"; // マウスを乗せたとき
    img11Out = new Image();
    img11Out.src = "img/door/4.gif"; // マウスを離した時

    img12Up = new Image();
    img12Up.src = "img/04.gif";
    img12Down = new Image();
    img12Down.src = "img/04.gif";
    img12Over = new Image();
    img12Over.src = "img/04.gif";
    img12Out = new Image();
    img12Out.src = "img/14.gif";

    img13Up = new Image();
    img13Up.src = "img/menu_u5+.jpg";
    img13Down = new Image();
    img13Down.src = "img/menu_u5+.jpg";
    img13Over = new Image();
    img13Over.src = "img/menu_u5+.jpg";
    img13Out = new Image();
    img13Out.src = "img/menu_u5.jpg";

    img14Up = new Image();
    img14Up.src = "img/menu_u6+.jpg";
    img14Down = new Image();
    img14Down.src = "img/menu_u6+.jpg";
    img14Over = new Image();
    img14Over.src = "img/menu_u6+.jpg";
    img14Out = new Image();
    img14Out.src = "img/menu_u6.jpg";

    img15Up = new Image();
    img15Up.src = "img/06.gif";
    img15Down = new Image();
    img15Down.src = "img/06.gif";
    img15Over = new Image();
    img15Over.src = "img/06.gif";
    img15Out = new Image();
    img15Out.src = "img/16.gif";

    img16Up = new Image();
    img16Up.src = "img/07.gif";
    img16Down = new Image();
    img16Down.src = "img/07.gif";
    img16Over = new Image();
    img16Over.src = "img/07.gif";
    img16Out = new Image();
    img16Out.src = "img/17.gif";

    img17Up = new Image();
    img17Up.src = "img/menu_u7+.gif";
    img17Down = new Image();
    img17Down.src = "img/menu_u7+.gif";
    img17Over = new Image();
    img17Over.src = "img/menu_u7+.gif";
    img17Out = new Image();
    img17Out.src = "img/menu_u7.gif";


}

function change(img, num) 
{
    if(version){
        switch(num){
        case 0:
            document.images[img].src = eval(img + "Up.src");
            break;
        case 1:
            document.images[img].src = eval(img + "Down.src");
            break;
        case 2:
            document.images[img].src = eval(img + "Over.src");
            break;
        case 3:
            document.images[img].src = eval(img + "Out.src");
            break;
        }
    }
}