Chris,
I know your wrote the UDF, fnInGroupAD() that is in our library. That is not the point. The point is anyone could write a UDF and call it fnInGroupAD(). Duke999 failed to say where he got the UDF from and we cannot assume that it is the one from this site.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.