Email not being Sent

[DavidPr]

I'm using the User Registration from the book by Larry Ullman "PHP and MYSQL for dynamc websites - second edition, and it is suppose to send an email to the person who just registered so thay can activate their account or registration. But no email is being sent out. Could something be missing from this?

I have the appropriate information (www and From: email) set in my actual script.

[PHP]// Send the email.
$body = "Thank you for registering at the User Registration site. To activate your account, please click on this link:\n\n";
$body .= "http://www.whateveraddressyouwanthere.com/activate.php?x=" . mysql_insert_id() . "&y=$a";
mail($_POST['email'], 'Registration Confirmation', $body, 'From: [e-mail]');[/PHP]
Is this all that's needed to send an email from this script?

[DavidPr]

It's sending an email now, but I can't get the login page to redirect me to another page upon a successful login.

[PHP]// Register the values & redirect.
$row = mysql_fetch_array ($result, MYSQL_NUM);
mysql_free_result($result);
mysql_close(); // Close the database connection.
$_SESSION['first_name'] = $row[1];
$_SESSION['user_id'] = $row[0];


// Start defining the URL.
$url = 'http://' . $_SERVER['HTTP_HOST'] . dirname($_SERVER['PHP_SELF']);
// Check for a trailing slash.
if ((substr($url, -1) == '/') OR (substr($url, -1) == '\\') ) {
$url = substr ($url, 0, -1); // Chop off the slash.
}
// Add the page.
$url .= '../image_load.php';[/PHP]

the image_upload.php is in directory - gallery. The login script is in the directory - registration, which is a sub-directory of gallery.

Edited**

I decided to just do this:
[PHP]// Start defining the URL.
$url = 'http://www.website.com/gallery/image_upload.php';

ob_end_clean(); // Delete the buffer.
header("Location: $url");
exit(); // Quit the script.[/PHP]

I didn't understand what that code meant, only that it wasn't redirecting my page. It is now.