jCarousel - Vertical Thumbnail Columns Are Advancing Too Far

Question

Though I was able to get the ul.jquery-vertical-column to cut itself in half, it seems like the next button is still advancing the thumbnails using the full height of the list. Here is what I've modified in jquery.jcarousel.js so far:

if (li.size() > 0) { var wh = 0, i = this.options.offset; li.each(function() { self.format(this, i++); wh += self.dimension(this, di)/2; //eff- Thumbnails are doubled so height is halved });

        this.list.css(this.wh, wh + 45 + 'px'); //eff- Adds 45px so last odd thumb doesn't get chopped in half
        // Only set if not explicitly passed as option
        if (!o || o.size === undefined)
            this.options.size = li.size();
    }

The problem is that the next button advances the thumbnails twice as far as they should go. See it in action here: http://www.allenrokachphotography.com/plugins/PikaChoose/index.html. Thanks - eff