access ckeditor from popup window

Hi,

I have the following javascript code to insert data into an instance of CKeditor...

CKEDITOR.instances.txtArea3.setData("hello world");

Works fine on the same page, however when I try and do a set data from the popup window I get a CKEDITOR.instances.txtArea3 is not defined....

Tried prefixing with opener.document and window.top.opener and whatnot...just can't get anything to work...

Anyone ever done this and succeeded, and if so, what is the code?

Thanks,