Multiple post image, echo url (path of image)

found the solution:

<div class="fill" style="background-image:url('<?php $custom = MultiPostThumbnails::get_post_thumbnail_id(get_post_type(), 'header-image', $post->ID); $custom=wp_get_attachment_image_src($custom,'header image'); echo $custom[0]; ?>');"></div>

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