Auto check WPUM login page's "remember me" field

checkrememberme

add_filter( 'login_form_fields', 'remember_me_checked' );

function remember_me_checked($fields) {
if ( isset( $fields['login']['remember'] ) ) {
    ?>
    <script type="text/javascript">
        function checkit() {
            document.getElementById('remember').checked = true;
        }
        window.onload = checkit;
    </script>
    <?php
}
return $fields;
}