So far it seems like it is impossible to bust out of an iframe when the framed site is an external link you have no access to. OK, why not just resize the iframe? If they click a submit button, lets shrink the iframe to 1px by 1px so the content is hidden. This would be good for cakeslices. You got a nice little slice of cake, they submit the email, the iframe shrinks, they assume you got their email. So, how to do it. I have done hours of Googling for different things with no success.