function nextPicture() {
    thisMovie("gallery").nextPicture();
    return false;
}

function prevPicture() {
    thisMovie("gallery").prevPicture();
    return false;
}

function thisMovie(movieName) {
    if (navigator.appName.indexOf("Microsoft") != -1) {
        return window[movieName];
    } else {
        return document[movieName];
    }
}