Example of how to alter the links within the 'attention box' on the EE thank you page to open in a new window.

example.php

<?php //Please do not include the opening PHP tag if you already have one

function ee_add_target_blank_to_thank_you_page_links() {
    wp_add_inline_script( 
        'thank_you_page',
        'jQuery( document ).ready(function($) {
            $("#espresso-thank-you-page-overview-dv .ee-attention a").each(function() {
                $(this).attr("target","_blank");
            });
        });'
    );
}
add_action( 'wp_enqueue_scripts', 'ee_add_target_blank_to_thank_you_page_links', 11 );