So right now, I'm just using a basic form to check a password. I want it to check the password and basically remain on page.html so I can use JavaScript to alert incorrect password or something. I'm not really sure how to do that. It seems it would bring me to check.php. I'm not too sure on the whole process, any help appreciated! Thanks!

Page.html

<form action="check.php" method="post">
    <input type="password" name="password" />
    <input type="submit" value="Submit" />

</form>

check.php

   <?php
    $password = $_POST['password'];
    if ( $password != "testing" ) {
        die();
    }
?>