Need A Simple iFrame Code

I need a script that creates an iframe for a specific website. And if the user goes to another webpage while browsing, the iframe breaks. For example: A redirect script goes to [login to view URL] and creates an iframe. Once a user finishes a payment to PayPal, he is redirected to a thank you page. When he goes to the thank you page, he breaks out of the iframe code. It is a very simple concept and shouldn't take more than an hour two to complete - so I am going to pay out $30 to whomever thinks they can do this task fast & effectively & ASAP. Thanks!