Box2D Forums

Hi, i am trying to make a bike game where i want the ground to be created using box2d, i want the bike to be created using a sprite in flash, but how do i integrate both, suppose i do not want the bike to fall through the box2d ground then how do i use hittestobject function to check , as in box2d there is no sprite just shapes and bodies so how will i check for collision .... kindly guide here...

Thanks in advance...

Jin