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I've never tried this but you could probably use segmentation to accomplish this.
You could set up a segmentation for "filled out x form" and segment the iframed page to show form if false, and the message if true.
The only downside is using up one of your 20 segmentations.
1. Create a "thank you" message the same size as your form on a new landing page. Then specify that landing page as your thank you page.*
* You could also place your thank you message on the SAME page as your form by using this guy's method: http://spamtech.co.uk/tips/position-content-inside-an-iframe/