swinging plate, how to?

I would like to make a rectangular plate that is fastened to two cords, right and left. The cords are softbodies, and the left side of the plate should follow the left cord-softbody and the right side of the plate the right cord-softbody. How do I do that? I guess I have to use bones, but I don´t know how (I have never used bones before). Can anybody point me in the right direction? Thanks!!

I would make a 3-bone armature, bones 1 and 3 for the cords, and bone 2 for the rod that hangs and controls the plate mesh. see http://mediawiki.blender.org/index.php/Manual/Character_Animation