add next/prev thumbnail to Siriux next/prev arrow

Greetings,

I just upgraded to the latest gallery, and am going through and rebuilding my custom Siriux based theme. I had custom implemented a next/previous rollover hack based on mrwilly's. I'm trying to re-implement it. I see that there is a built in 'next/prev' roll over hack already there by default; I'd like to replace the arrows with a small thumbnail of the next or previous image. The old code is not working; I was wondering if someone could help me figure it out?

http://www.mikelanni.com/gallery -- I have some more updates to do so it will be turned off probably for another hour Sat july 22nd 3pm PST-4pm PST