// ************************************************

if (document.images) {
    image1on = new Image();
    image1on.src = "images/ButPhotosOn.gif";

    image2on = new Image();
    image2on.src = "images/ButGuestBookOn.gif";

    image1off = new Image();
    image1off.src = "images/ButPhotosOff.gif";

    image2off = new Image();
    image2off.src = "images/ButGuestBookOff.gif";
}

function changeImages() {
    if (document.images) {
        for (var i = 0; i < changeImages.arguments.length; i += 2) {
            document[changeImages.arguments[i]].src = eval(changeImages.arguments[i + 1] + ".src");
        }
    }
}