Music Player in KLWP

Hello I'm trying to set up a music player that shows the cover art of the previous song, the current song playing, and the one coming up next. I know how to get the current cover art to show up but I don't know the formulas for the previous and next cover images. Does anyone know how to achieve this?

At this moment you only can add the title and the sub(normally the artist) of the nexts and previous songs on Klwp in the mq codes.