I...don't really know anything about 2k/2k3 stuff... but if it's anything like eventing in VX or XP, then you can create a graphic event or a series of graphic events with 2 pages, each the same bridge graphic. Then line either side of the bridge with blank events and if player touches those blank events, then the bridge pieces become graphics above the character. Then at each end of the bridge (not in the water) if the player touches, then all the bridge pieces become graphics below the player.