There are many ways to show thumbnail gallery in sidebar in WordPress. You can use NextGen plugin or various other plugins.
Following is a very simple and straight forward code to show thumbnail gallery in sidebar.
[sourcecode language=”php”]<?php query_posts(array(‘orderby’ => ‘rand’, ‘cat’ => 391, ‘showposts’ => 12));
if (have_posts()) : while (have_posts()) : the_post(); ?>
<a href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
<?php if ( function_exists("has_post_thumbnail") && has_post_thumbnail() ) { the_post_thumbnail(array(71,71), array( "class" => "home_thumb", ‘alt’ => ”.get_the_title().”) );} ?>
</a>
<?php endwhile; ?>
<?php endif; ?>
[/sourcecode]
Above code is pretty straight forward. It shows random thumbnails. you can adjust the width and height as per your requirements and also the number of thmbnails to show.
![Wordpress - Sidebar Thumbnail Gallery Wordpress - Sidebar Thumbnail Gallery](http://www.ajaykumarsingh.com/wp-content/uploads/2011/08/wordpress-sidebar-thumbnail-gallery.jpg)
You can see it live on Bollywood blog in right sidebar at the bottom.
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