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Switching between two Loads and two Voltages?

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http://forum.allaboutcircuits.com – Hello, New here, have a question. I am tryin to create a very simple circuit. I have a 12V source that goes into 2 diodes into series, then out to the load. Then I have a 5V source that goes into a single Schottky Diode, then out to the same load. I need to be able to switch between them with a single jumper. I don't have much space to do this on the circuit board, so the less components, the better. I've heard this can be done with a PNP and an NPN transistor, but can't figure it out. Can someone here help me out? Thanks in Advance! (Embedded)