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If I'm not mistaken, Blizz changed RD to do this automatically a while back, without needing the macro.
Apparently they did.. but I can't confirm it becuase -- since you needed RD macroed for SOOO long, I got so used to using it. When the change happened (RD still behaves the same way as it always did.. as in it casts on the FRIENDLY, apparently the spell just has the macro built in now) I never removed my macro. I've been using it the whole time and never bothered to try without it :D
But the macro that neph gave will work, either way. It will try to cast on your target if it's friendly, or the target OF your target if it's not. It has some redundant bits that aren't needed, but it'll work :D