Scroll to top of the page during Event Espresso's Single page checkout steps

functions.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

function my_always_scroll_to_top() {
    ?>
    <script>
      jQuery( document ).on('ajaxComplete ready', function() {
         var scroll_pos=(0);          
        jQuery('html, body').animate({scrollTop:(scroll_pos)}, '2000');
    });
    </script>
    <?php

}
add_action( 'AHEE__EED_Single_Page_Checkout__enqueue_styles_and_scripts', 'my_always_scroll_to_top' );