Apply gravity to mecanim character

I am using mecanim for my character, using the (layer) animation controller unity gives you. Now i have added a dive state for my guy and when i run up a ramp my character will follow through with this dive animation in mid air the fall after exit time.so basicly when i try to jump of the ramp instead of falling my guy does hi animation in mid air then he falls down. So can anyone point me in the right direction.