Two part form in PHP

I have created a two part form with PHP / html for registration purposes. Once the user clicks register they are taken to a new page saying that it was successful (or that there was an error). I want to add a button on this second page that would allow the visitor the option of going back to that first page and registering another person. This raises two questions:

1. Is it possible to add html controls (in this case basically a back button) in a PHP script and how could I accomplish this?

2. How do I redirect my visitor back to the main page?

Thanks!