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$def with(book, size="M")

$ title = book.title_prefix + " " + book.title

$ olid = book.key.split("/")[2]

$code:
    def aname(a):
        if isinstance(a, basestring):
            return a
        else:
            return a.name or ""

$if size == "M":
    <div class="cover-wrapper">
        <img src="http://covers.openlibrary.org/b/olid/$olid-M.jpg?default=false" onerror="\$(this).hide(); \$('#default-cover-$olid').show();" width="173"/>
        <div class="default-cover-$size.lower()" id="default-cover-$olid" style="display: none;">
            <div id="book-title">
                $ author_names = ", ".join(aname(a) for a in book.authors) or book.get('by_statement','')
                $:macros.TruncateString(title, 70)
                <div id="author-names">$author_names</div>
            </div>
        </div>
    </div>
$else:
    <img src="http://covers.openlibrary.org/b/olid/$olid-S.jpg?default=http://openlibrary.org/static/images/blank.book.png" height="58"/>