Is there a "splitter" for the aux and ipod inputs?

[2manycars]

I spoke to my dealer and told him it would be nice to be able to have the choice of XM radio or IPOD tunes without unplugging one to plug in the other. They are not aware of a splitter, but said maybe I could make one. I prefer not to "mess around" with the electronics, and wondered if anyone has found such an item anyplace?

[scudrunner]

I would guess that you would have to have a switchable input. I don't think you could just have them both plugged into the same input without it.