Help with a Diode Circuit?

Find Vout for the following circuit when Vin = 12V and when Vin= -12V. a href="http://imgur.com/MLLmd.jpg" rel="nofollow"http://imgur.com/MLLmd.jpg/a . To me, it seems like in both cases, the circuit would act as a voltage divider with Vout = (Equivalent Resistance of Grounded Resistors)*Vin / Req but with the negative voltage, I think that the node with the diode is an open circuit so its only Vout = 100 ohms*-12V / 100 ohms. The potential difference across the diode is to be taken at 0.6V but I can't see how that would matter. I just see the diode blocking any current through R2 if the voltage is negative. Am I oversimplifying the problem?