I have an account at ECWID. I logged into their site, copied the bag script for my account, pasted it into a placeholder rectangle in the Replace with HTML Code (Body) section (for more information see Help > Index > Placeholder Objects)
This is what I was suggesting.
If you have an account (and you need one before you can do anything), log in and go to the Dashboard section. All the scripts you need are right there.
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