[ic] window.opener property missing in new window

[Honest to Goodness]

I'm implementing the Canada Post eparcel service in my modified
foundation checkout page. In the pages/ord/checkout.html page there is a
little bit of javascript that verifies the form input and from there I
open a new window with just some hello world stuff in it for now.

The plan is that the new window will contain some html sent back to me
from the Canada Post server in response to some XML that I have composed
and sent to them. Their html is a cute little form with radio buttons
allowing the customer to choose how quickly they want their products
delivered and what the price will be.

My fantasy is that when the customer chooses their shipping the charge
will be sent to the checkout page via the window.opener javascript
property and will magically appear in the form.

As I write this I realize how totally naive I am. My new window doesn't
have any window.opener property because it was coughed up by the cgi
program. And the checkout page is not going to just sit there and be
updated, it will have to be rewritten based on the changes in some
variables.

So the alternative is to have my Canada Post page show up before the
checkout page in a serial fashion and then pass it's output on? It would
be nice to have it embedded right in the check out page though ...

Any ideas? I seem to have too many.