This code is usefull if you need to embed a Google Books Preview in your posts or pages using shortcode, when writing your content add the shortcode [gbooks id=""] with the id of the book and will be appended in a frame large 600 and tall 900 px. Continue reading
add_shortcode('gbooks', 'sc_embed_google_books');
function sc_embed_google_books( $atts ){
extract(shortcode_atts(array(
"id" => '',
"width" => '600',
"height" => '900',
), $atts));
return '<script type="text/javascript" src="http://books.google.com/books/previewlib.js"></script>
<script type="text/javascript">
GBS_insertEmbeddedViewer("'.$id.'", '.$width.','.$height.');
</script>';
}