Display custom fields of all sub pages

I am trying to display certain custom fields of all subpages of a parent. I would like to place this within a loop.

Here is the static code below:

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This is actually a jquery image gallery.

I found this code that works for a page thumbnail and pulls it from all of the sub pages of a parent but am not sure how to convert it to pull a special field from all sub pages. Any help would be greatly appreciated!!!

Here is the thumbnail code:

<?php query_posts(array('post_parent' => 6, 'post_type' => 'page')); while (have_posts()) { the_post(); ?>
            <?php if ( has_post_thumbnail() ) {?>
                <?php the_post_thumbnail(); ?>
            <?php } else { ?>
                <!-- Else Don't show anything -->
            <?php } ?>
    <?php } ?>