Problem with getting prev and next buttons to work.

Problem with getting prev and next buttons to work.

I have this working about 99% of the way.. But I have once last issue that is killing me..

I know it is right in front of me to.

See the following home page: http://24.173.38.223/

I have 2 arrows next to the slideshow that control the carousel images for going up and down. I am trying to get the up and down button to set a class for the next image that moves to the top.