Session not registering

[bjblackmore]

Hi,
I have a form with a textbox called 'email' and then a submit button. I want to register $email, and them open another page. So I have..
if ($submit){
session_register('email');
Header("Location: http://www.mydomain.com/page2.php");
}

Then on page2.php I have echo $email.
For some reason the session isn't displayed. However, if I remove
Header("Location: http://www.mydomain.com/page2.php");
from the if statement, press submit, then manually open page2.php, the session is displayed. Can anyone tell me why? It seems that having the header("location.... in the if statement either stops the session registering, or wipes it after its registered.
Can anyone help?
Thanks
Ben

[junebug]

that's weird. are you registering the variable within a function?

[bjblackmore]

No, just doing...

session_start();
if ($submit){
$worked=session_register('email');
Header("Location: http://www.domain.com/page2.php");
}

echo '<form action="'. $PHP_SELF .'" method="POST">
<input type="text" name="email" value="'. $email .'" size="40" maxlength="40">
<input type="SUBMIT" name="submit" value="Submit Details">
</form>';

If I take the "Header("Location: http://www.domain.com/page2.php");" out of the 'if ($submit)' statement, and then go to page2.php by typing it in the url bar, it works fine, shows $email as anything I type in. But with the "Header("location... it just shows blank.
Ben