| This presentation object dynamically creates an HTML page with two frames,
consisting of the Buy presentation object and the URL of the item
in question.
Parameters:
- add - If specified, the Buy presentation object is passed this value,
identifying the item on the screen.
- ref - The value is the URL used for the lower frame, otherwise a default
HTML file is loaded.
- newItem - If specified, this item is added to the cart and the cart
object displayed.
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