Alpha Show Featured Image

<?php
$img_url = wp_get_attachment_url(get_post_thumbnail_id(),'full'); // Get full URL to image
if(img_url) {  ?>
 <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="highlight-img"><img src="<?php echo $img_url; ?>" alt="<?php echo the_title(); ?>" /></a>
<?php } ?>