Page Thumbnail background

Hi there,

I am trying to use the featured image of a page as the background image of a div on my static page.

<?php
$page = get_post_by_title( 'About' );
$thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' );?>
<div class"aboutright" style="background-image: url('<?php echo $thumb['0'];?>')"></div>

Thanks very much for any help.

Cheers,

Phil