var shuffleNo= 0;

function Choice() {
    document.getElementById("photo01").src=images[shuffleNo];
}

function ImgForward() {
    shuffleNo++;
    if(shuffleNo>=images.length)
        shuffleNo = 0;
    Choice();
return;
    nummer = shuffleNo;
    if(nummer >= slides) {
        shuffleNo = 1;
    } else {
    shuffleNo = shuffleNo + 1;
    }
    Choice()
    document.getElementById("photo01").src = imgSrc;
    return
}

function ImgBackward() {
    shuffleNo--;
    if(shuffleNo<0)
        shuffleNo = images.length-1;
    Choice();
return;
    nummer = shuffleNo;
    if(nummer == 1) {
        shuffleNo = slides;
    } else {
    shuffleNo = shuffleNo - 1;
    }
    Choice()
    document.getElementById("photo01").src = imgSrc;
    return
}