Conducting wires above a conducting plane carry currents I1 and I2 in the directions shown...

Conducting wires above a conducting plane carry currents I1 and I2 in the directions shown in Fig. 1. Keeping in mind that the direction of a current is defined in terms of the movement of positive charges, what are the directions of the image currents corresponding to I1 and I2?

Figure 1

Currents above a conducting plane.