Collision Detection for existing actionscript 3 framework.

I require an actionscript 3 programmer to implement a collision detection system into a basic actionscript 3 framework that I am working on. The system needs to be able to: - Efficiently detect collision between two or more objects. - Be able to detect accurate collisions between objects of varying shapes, for example, I must be able to make a character walk along sloped objects, or even curved surfaces. - Be optimized. Things like spatial partitioning etc. The implementation of the system will be in an actionscript 3 game framework so it must be usable for this purpose, with a focus on speed and efficiency. I do not require physics simulation, however, I must have enough data collected from the collision so I can code my own collision handling that takes into account, for example, the angle of the surface touched. On a side note, I am also looking for a coder who I can use again, as I have many other required changes which I will post here as separate projects. Thanks.