I am working on a project where I need a DC motor to run forwards and backwards. After some research I thought that this H-Bridge would do the trick. So I hooked it up via an Arduino (AVR chip) to provide logic control and a wall-wart (3A) 12VDC supply to provide power for the motor. The motor runs and stops as instructed by the AVR, but no matter what it always runs in the same direction even though the AVR chip should be telling it to run in two directions. Can any electronics experts here tell me why this @#$@# motor would only run in one direction connected to this H-Bridge?

The schematic is attached for those so inclined. I'm attaching the motor to the H Bridge by hooking up output 1 of the bridge to one motor pole and output 2 to the other motor pole (is this right??).