Flipmo Effect


I’m a big fan of www.flipmo.co.uk and i was wondering how to achieve the effect of the thumbnails rollover effect (under work) where each is pushed up as one expands. If u look at the cpu usage i can only assume it uses some linklist structure and an onclipevent(enterframe) of somesort on each mc in the chain. Is there a way to achieve this with listeners. I am not hot with these so am not sure where to start. Any guidelines would be much appreciated.