YAHOO.widget.Carousel.prototype._autoScroll = function() {
    var carousel  = this,
        currIndex = carousel._firstItem,
        index, currPage, newPage;

    if (currIndex >= carousel.get("numItems") - 1) {
        if (carousel.get("isCircular")) {
            index = 0;
        } else {
            carousel.stopAutoPlay();
        }
    } else {
        currPage = carousel.getPageForItem(currIndex);
        index = currIndex + carousel.get("scrollIncrement");
        newPage = carousel.getPageForItem(index);
    }

    if (currPage != newPage) {
        carousel._selectedItem = carousel._getSelectedItem(index);
        carousel.scrollTo.call(carousel, index);
    } else {
        carousel.selectNextItem();
        // because of a bug in scrollTo
        clearTimeout(carousel._autoPlayTimer);
        delete carousel._autoPlayTimer;
        if (carousel.isAutoPlayOn()) {
            carousel.startAutoPlay();
        }
    }
}