Image only URL without HTML

btw. I don’t know why but I’m not able to display the content of the category by using this:

<?php
    global $enhanced_category;
    //get enhanced category post and set it up as global current post
    $enhanced_category->setup_ec_data();
?>
<!-- enhanced category content -->
<?php the_post_thumbnail("medium"); ?>

<?php get_template_part( 'content', 'page' ); ?>

<!-- custom fields -->
<?php
    get_post_custom();
?>

<?php
    // If comments are open or we have at least one comment, load up the comment template
    if ( comments_open() || get_comments_number() ) :
        comments_template();
    endif;
?>

instead I had to include() the content-ecp.php file directly, and it’s now working.

never mind. figure it out.

<?php 
$banner_img = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ), 'full' );

echo $banner_img[0]; // returns only the url of the full image.
?>