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Hoople - 5:26 pm on Aug 5, 2011 (gmt 0)
Those that populate the pop-up with text from an on-page hidden div (CSS display:none) will be seen by Goolge.
Other lightbox implementations use data blocks within the js to populate the pop-up. Google claims they can read js, but will the form's content have a lesser influence on that page's ranking than the hidden div?