PHP script won't display HTML.

[BuaxDesigns]

Proberly a noobish error, but it's 3:20AM and I can't find it and it's really annoying me.

<?php
include("config.php");
 if(isset($_POST['submit'])) {
    $username = addslashes($_POST['username']);
    $email = addslashes($_POST['email']);
    $password1 = $_POST['password1'];
    $password2 = $_POST['password2'];
    if(empty($username) ||
       empty($email) ||
       empty($password1) ||
       empty($password2)) { 
        die("You missed out a field!");

    } else {

        if($password1 != $password2) { 

            die("Your passwords did not match.");

        } else {
 
            $junk = array('¬','`','!','\"','£','$','%','^','&','*','(',')','_','-','+','=','[',']','{','}',';',':','@','\'','#','~','<','>',',','.','/','?','\\','|',' ');
 
            $new_un = str_replace($junk,"",$username);
 
            if($new_un < $username) {
 
                die("Your username contained invalid characters.");
 
            } else {
 
                $pw_len = strlen($password1);
 
                if($pw_len < 6) {
 
                    die("Your password is too short. It needs to be 6 or more characters.");
 
                } else {
 
                    $istaken = mysql_num_rows(mysql_query("SELECT * FROM `users` WHERE `username`='" . $username . "'"));
 
                    if($istaken >= 1) {
 
                        die("That username is already being used.");
 
                    } else {

                    $istaken = mysql_num_rows(mysql_query("SELECT * FROM `users` WHERE `email`='" . $email . "'"));
 
                    if($istaken >= 1) {
 
                        die("That email is already being used.");
 
                    } else {
 
                        $password = md5($password1);
 
                        $create = mysql_query("
                        INSERT INTO `users` (
                        `id`,
                        `username`,
                        `password`,
                        `email`,
                        ) VALUES (
                        NULL,
                        '" . $username . "',
                        '" . $password . "',
                        '" . $email . "'
                        );
                        ");
 
                        if(!$create) {
 
                            die("There was a problem creating the user.");
 
                        } else {
 
                            die("You were registered successfully. Click <a href='login.php'>here</a> to login.");
 
                        }
 
                    }
 
                }
 
            }
 
        }
 
    }
 
} 

?>
<form id="register" method="post" action="<?= $_SERVER['PHP_SELF'] ?>">
 
Username:<br />
<input type="text" name="username" /><br /><br />

Email:<br />
<input type="text" name="email" /><br /><br />
 
Password:<br />
<input type="password1" name="password1" /><br /><br />
 
Confirm Password:<br />
<input type="password2" name="password2" /><br /><br />
 
<input type="submit" name="submit" value="Register" />

</form>
<?php

}

?>

It's a register script by the way. Incase you didn't know :/

[BuaxDesigns]

I cant my posts yet; but I've fixed the error.