var cntImages = aryImage.length;
var imgLeftIndex = 0;
var imgRightIndex = 1;

function scrollImage(direction) {
        if(direction == 'up') {
                imgLeftIndex = imgLeftIndex + 2;
                imgRightIndex = imgRightIndex + 2;
        } else if(direction == 'down') {
                imgLeftIndex = imgLeftIndex - 2;
                imgRightIndex = imgRightIndex - 2;
        }

        if (imgRightIndex < 0) { imgRightIndex = imgRightIndex + cntImages; }
        if (imgLeftIndex < 0) { imgLeftIndex = imgLeftIndex + cntImages; }
        if (imgRightIndex > cntImages-1) { imgRightIndex = imgRightIndex - cntImages; }
        if (imgLeftIndex > cntImages-1) { imgLeftIndex = imgLeftIndex - cntImages; }

        document.images["imgRight"].src = aryImage[imgRightIndex];
        document.images["imgLeft"].src = aryImage[imgLeftIndex];
}

function hi(imgs) {
        document.images[imgs].src = aryOnImage[imgLeftIndex];
}

function re(imgs) {
        document.images[imgs].src = aryImage[imgLeftIndex];
}

function hi2(imgs) {
        document.images[imgs].src = aryOnImage[imgRightIndex];
}

function re2(imgs) {
        document.images[imgs].src = aryImage[imgRightIndex];
}