redirecting in the middle of a code

if ($email != VALID_email)
{
header("Location: create3.php?error=invalid_email");
} else if (!empty($db_email)) {
header("Location: create3.php?error=already_email");
} else {
if($password != VALID_PASSWORD)
{
header("Location: create3.php?error=invalid_password");
} else if (!empty($db_password)) {
header("Location: create3.php?error=already_password");
} else {
mysql_query('INSERT INTO `accounts` VALUES (``, $email,
$password)');
header("Location: index.php");
}
}
mysql_close();


Warning: Cannot modify header information - headers already sent by
(output started at C:\AppServ\www\opinionsofamateurs\accounts
\create2.php:12) in C:\AppServ\www\opinionsofamateurs\accounts
\create2.php on line 32


How to solve?
.