1. What you are looking for should be coded in Javascript and not PHP, since the code runs on the client and not the server. For this just make the prompt-box calling a function which calls up the prompt-box again (when clicked on ok).
2. Anyhow, you could do it with PHP (and Javascript). Simply call the site again when clicking on ok - and just give a $_GET variable with. Then make php writing the confirm box again. So it would pop up untill the user klicks on cancel. But thats some dump and useless way to do it
3. Java != javascript

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