Yea! Ok Richard no offense you just confused me. Its cool though. Its not really that hard. Ok here is how I would do it. You want their header to contain their email? If so then here is how you would do it. Assume that emailaddress is coming from a form that they filled out on the other page. Then you would want do this:
<header>
<?php
print("<title>$emailaddress</title>
?>
</header>
<?php
....More PHP code if you want or just continue with the rest of the page.
?>