Create a Widget Area with Featured image as background for Genesis

functions.php

<?php // remove this line

// Register OnTop Widget

genesis_register_sidebar( array(
'id'    => 'ontop',
'name'  => __( 'OnTop', 'jan' ),
'description'   => __( 'This the Ontop widget', 'jan' ),
) );

// Adding option to use featured image (if it exists)
// as background image
 
add_image_size( 'featured-banner', 2000, 500, TRUE ); // creates a featured image size for the banner
 
function jan_featured_img() {
	if ( has_post_thumbnail() ) { // checks post has thumbnail
	// gets URL for that image
	$background = wp_get_attachment_image_src( get_post_thumbnail_id( $page->ID ), 'featured-banner' ); 
	if (is_array($background)) {   
    // echo the output
	echo '<div class="features" style="background: url(' ;
	echo $background[0];
	echo ') no-repeat scroll center center #FFFFFF"><div class="wrap">';
		genesis_widget_area( 'ontop', array(
		'before' => '<div class="features-widgetarea">',
		'after' => '</div>',
	) );
		echo '</div></div>'; 
	}}
	else { // if no featured image, adds class to use default image
	echo '<div class="features"><div class="wrap">';
		genesis_widget_area( 'ontop', array(
		'before' => '<div class="features-widgetarea">',
		'after' => '</div>',
	) );
		echo '</div></div>';
}}
 
add_action( 'genesis_after_header', 'jan_featured_img' );