jQuery Cycle Reverse Transition Wipe

jQuery Cycle Reverse Transition Wipe

I'm using the "next" and "prev" buttons and the "wipe" transition. Currently the transition goes from left to right ("l2r") when "next" or "prev" are clicked. I would like it so that when you click "prev" it goes in reverse, right to letf ("r2l"). I'm aware you can edit the javascript source file to accomplish this, but I am not skilled enough to pull this off. Any help would be appreciated. Thanks!