Contact Form 7 Paypal Lightbox

So i’ve added Contact Form 7 and the Paypal plugin for it, however i’m trying to keep from having to redirect to another page leaving my site. Ideally the redirect would open up into an iframe inside a lightbox. i know this has to be possible, but i’m just not sure all the steps. i tried adding the lightbox id to the submit button, but that didn’t work.

any pointers, thoughts, links would be helpful!

thanks!