[Plugin: Network Latest Posts] diffrent size for thumbnails

[ Moderator Note: Please post code or markup snippets between backticks or use the code button. ]

You need to add:
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function network_latest_posts_shortcode($atts){
    // Constructor
    extract(shortcode_atts(array(
        'title' => null,
        'number' => '10',
        'days' => '0',
        'titleonly' => true,
        'wrapo' => null,
        'wrapc' => null,
        'blogid' => 'null',
        'thumbnail' => false,
        'cpt' => 'post',
        'ignore_blog' => 'null',
        'cat' => 'null',
        'tag' => 'null',
        'paginate' => false,
        'excerpt_length' => 'null',
        'display_root' => false,
        'auto_excerpt' => false,
        'full_meta' => false,
         <strong>'size' => 'thumbnail'</strong>
    ), $atts));
    // Avoid direct output to control the display position
    ob_start();
    // Check if we have set a title
    if( !empty( $title ) ) { echo "<div class='network-latest-posts-sectitle'><h1>".$title."</h1></div>"; }
    // Get the posts
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network_latest_posts($number,$days,$titleonly,$wrapo,$wrapc,$blogid,$thumbnail,$cpt,$ignore_blog,$cat,$tag,$paginate,$excerpt_length,$display_root,$auto_excerpt,$full_meta, <strong>$size</strong>);
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$blogdetails = get_blog_details( $blog_id );
<strong>$size=explode('X',$size);</strong>
$thumbcode = str_replace( $current_blog->domain . $current_blog->path, $blogdetails->domain . $blogdetails->path, get_the_post_thumbnail( $post_id, $size, $attrs ) );
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and now you can use additional attribute in short code size=’100X100‘

http://wordpress.org/extend/plugins/network-latest-posts/