Friends, Im a newbie and I'm planning to buy my new DSLR which will be one of Nikon D3000 or D3100 or D5000. i want to use Nikon SB-400 with any of the above cameras but in a off-camera mode. i know it is not that easy. so please tell me how to do it, with any other supporting devices or cords or any other methods. thanx.