Show Images Link Manager

Hi,

I am using the Link Manager plugin with WP 3.6.1. https://www.ads-software.com/support/plugin/link-manager

I would like to display the images set in each link.

I am using this code to display the text links:

<!-- link categories -->
<div class="linkcategories">
<?php $cats = get_categories( "taxonomy=link_category&hierarchical=0" );
foreach ( $cats as $cat ) {
    echo '<a name="' . $cat->cat_name . '"></a><h3>' . $cat->cat_name . '</h3>';
    echo '<ul>';
    $books = get_bookmarks( "category=$cat->cat_ID" );
    foreach ( $books as $book ) {
        echo '<li>';
        echo '<a href="' . $book->link_url . '">' . $book->link_name . '</a>';
        echo '</li>';
    } // end books loop
    echo '</ul>';
} // end cats loop;
?>
</div><!-- end of link categories -->