The ID (and name) attribute is set to "qcontent" if you are editing a question and "acontent" if you are editing an answer. I believe that is set by the Q2A core code, so changing theme shouln't change that ID.
@DisgruntledGoat, thanks much for the rule of thumb about editor object.. the mysteries of ckeditor are starting to unfold.. !?
I now see this in Firebug..
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