Save this file as page_idx-template.php and upload it to your child theme. Then create a page via the Pages --> Add New menu in your WordPress dashboard and select the "IDX Broker" page template.

page_idx-template.php

<?php
/*
 *
 * Template Name: IDX Broker
 *
 * This template is for displaying the IDX info from
 * IDXBroker.com in your Genesis child theme.
*/

add_action( 'genesis_before_content', 'wsm_idx_open_tag' );
function wsm_idx_open_tag() {
	echo '<div id="idxStart" style="display: none;"></div>';
}

add_action( 'genesis_after_content', 'wsm_idx_close_tag' );
function wsm_idx_close_tag() {
	echo '<div id="idxStop" style="display: none;"></div>';
}

genesis();