Connect the handbrake line to the other side of the circuit. If you have it connected to positive, connect it to the ground.
And it's handbrake. A handbreak will result in a cast on your arm.
i have just bought an in car dvdplayer and it has asked me to connect it to the handbreak, which i have done, however everytime the handbreak is not up i get an error saying that i should not be watching it, is their anyway to fake the signal sent by the handbreak so the dvd player thinks it is always on??