if (document.images) {
        PhoMenubuttonup = new Image();
        PhoMenubuttonup.src = "images/phoBtn.gif";
        PhoMenubuttondown = new Image();
        PhoMenubuttondown.src = "images/phoBtn_over.gif";

        ChaoMenubuttonup = new Image();
        ChaoMenubuttonup.src = "images/chaoBtn.gif";
        ChaoMenubuttondown = new Image();
        ChaoMenubuttondown.src = "images/chaoBtn_over.gif";

        MiMenubuttonup = new Image();
        MiMenubuttonup.src = "images/miBtn.gif";
        MiMenubuttondown = new Image();
        MiMenubuttondown.src = "images/miBtn_over.gif";

        BunMenubuttonup = new Image();
        BunMenubuttonup.src = "images/bunBtn.gif";
        BunMenubuttondown = new Image();
        BunMenubuttondown.src = "images/bunBtn_over.gif";

        RiceMenubuttonup = new Image();
        RiceMenubuttonup.src = "images/riceBtn.gif";
        RiceMenubuttondown = new Image();
        RiceMenubuttondown.src = "images/riceBtn_over.gif";

        AppMenubuttonup = new Image();
        AppMenubuttonup.src = "images/appspecBtn.gif";
        AppMenubuttondown = new Image();
        AppMenubuttondown.src = "images/appspecBtn_over.gif";

        DessertsMenubuttonup = new Image();
        DessertsMenubuttonup.src = "images/dessertsBtn.gif";
        DessertsMenubuttondown = new Image();
        DessertsMenubuttondown.src = "images/dessertsBtn_over.gif";

    }
    function buttonMenudown(MenuButtonName) {
        if (document.images) {
            document[MenuButtonName].src = eval(MenuButtonName + "down.src");
        }
    }
    function buttonMenuup(MenuButtonName) {
        if (document.images) {
            document[MenuButtonName].src = eval(MenuButtonName + "up.src");
        }
    }