Been there done that - unfortunately I bought into Java and it looks mighty pretty so I can't go back easily. Solution PCwise is to provide the Acrobat. I just thought the same wheeze works on Macs - and it looks possible. The Ultimate trick is the dual partition CD but that is proving difficult - or expensive anyway. The problem is if it is intended for a larger market I have to cover the shortcomings of the myriad possibilities and still look like a professional result.