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

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

    img2Up = new Image();
    img2Up.src = "images/button/on/sp.gif";
    img2Down = new Image();
    img2Down.src = "images/button/on/sp.gif";
    img2Over = new Image();
    img2Over.src = "images/button/on/sp.gif";
    img2Out = new Image();
    img2Out.src = "images/button/sp.gif";

    img3Up = new Image();
    img3Up.src = "images/button/on/sp1.gif";
    img3Down = new Image();
    img3Down.src = "images/button/on/sp1.gif";
    img3Over = new Image();
    img3Over.src = "images/button/on/sp1.gif";
    img3Out = new Image();
    img3Out.src = "images/button/sp1.gif";

    img4Up = new Image();
    img4Up.src = "images/button/on/sp2.gif";
    img4Down = new Image();
    img4Down.src = "images/button/on/sp2.gif";
    img4Over = new Image();
    img4Over.src = "images/button/on/sp2.gif";
    img4Out = new Image();
    img4Out.src = "images/button/sp2.gif";

    img5Up = new Image();
    img5Up.src = "images/button/on/sp3.gif";
    img5Down = new Image();
    img5Down.src = "images/button/on/sp3.gif";
    img5Over = new Image();
    img5Over.src = "images/button/on/sp3.gif";
    img5Out = new Image();
    img5Out.src = "images/button/sp3.gif";

    img6Up = new Image();
    img6Up.src = "images/button/on/obj.gif";
    img6Down = new Image();
    img6Down.src = "images/button/on/obj.gif";
    img6Over = new Image();
    img6Over.src = "images/button/on/obj.gif";
    img6Out = new Image();
    img6Out.src = "images/button/obj.gif";

    img7Up = new Image();
    img7Up.src = "images/button/on/plo.gif";
    img7Down = new Image();
    img7Down.src = "images/button/on/plo.gif";
    img7Over = new Image();
    img7Over.src = "images/button/on/plo.gif";
    img7Out = new Image();
    img7Out.src = "images/button/plo.gif";

    img8Up = new Image();
    img8Up.src = "images/button/on/fineart.gif";
    img8Down = new Image();
    img8Down.src = "images/button/on/fineart.gif";
    img8Over = new Image();
    img8Over.src = "images/button/on/fineart.gif";
    img8Out = new Image();
    img8Out.src = "images/button/fineart.gif";

    img9Up = new Image();
    img9Up.src = "images/button/on/anothersite.gif";
    img9Down = new Image();
    img9Down.src = "images/button/on/anothersite.gif";
    img9Over = new Image();
    img9Over.src = "images/button/on/anothersite.gif";
    img9Out = new Image();
    img9Out.src = "images/button/anothersite.gif";

    img10Up = new Image();
    img10Up.src = "images/button/on/link.gif";
    img10Down = new Image();
    img10Down.src = "images/button/on/link.gif";
    img10Over = new Image();
    img10Over.src = "images/button/on/link.gif";
    img10Out = new Image();
    img10Out.src = "images/button/link.gif";


    img11Up = new Image();
    img11Up.src = "images/button/on/blog.gif"; // クリックを止めた時
    img11Down = new Image();
    img11Down.src = "images/button/on/blog.gif"; //クリック時
    img11Over = new Image();
    img11Over.src = "images/button/on/blog.gif"; // マウスを乗せたとき
    img11Out = new Image();
    img11Out.src = "images/button/blog.gif"; // マウスを離した時

    img12Up = new Image();
    img12Up.src = "images/button/on/email.gif";
    img12Down = new Image();
    img12Down.src = "images/button/on/email.gif";
    img12Over = new Image();
    img12Over.src = "images/button/on/email.gif";
    img12Out = new Image();
    img12Out.src = "images/button/email.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;
        }
    }
}