How to add Images search in Nexgen Gallery for wordpress?

To do this first of all we need to install both nexgengallery and nexgengallery search. After activating both the plugins need to follow below steps.

1. Open search.php of your current theme from themes.
2. Copy and paste the below code into the search.php. This code will work for both searching content and images.
<?php
/**
 * The template for displaying Search Results pages.
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */

get_header(); ?>

        <section id="primary">
            <div id="content" role="main">



            <h1 class="page-title"><?php printf( __( 'Search Results for: %s', 'twentyten' ), '<span>' . get_search_query() . '</span>' ); ?></h1>

<?php if ( have_posts() ) : ?>

<?php if ( function_exists( 'ngg_images_results' )  && have_images() )  : ?>

        <h2 class="pagetitle">Image Search Results</h2>
        <?php ngg_images_results(); ?>

        <?php endif; ?>

    <?php elseif ( function_exists( 'ngg_images_results' )  && have_images() )  : ?>

        <h2 class="pagetitle">Image Search Results</h2>
        <?php ngg_images_results(); ?>

    <?php else : ?>

        <h2 class="center">No posts found. Try a different search?</h2>
        <?php get_search_form(); ?>

    <?php endif; ?>

<?php if ( have_posts() ) : ?>
<header class="page-header">
                    <h1 class="page-title"><?php printf( __( 'Search Results for: %s', 'twentyeleven' ), '<span>' . get_search_query() . '</span>' ); ?></h1>
                </header>

                <?php twentyeleven_content_nav( 'nav-above' ); ?>

                <?php /* Start the Loop */ ?>
                <?php while ( have_posts() ) : the_post(); ?>

                    <?php
                        /* Include the Post-Format-specific template for the content.
                         * If you want to overload this in a child theme then include a file
                         * called content-___.php (where ___ is the Post Format name) and that will be used instead.
                         */
                        get_template_part( 'content', get_post_format() );
                    ?>

                <?php endwhile; ?>

                <?php twentyeleven_content_nav( 'nav-below' ); ?>

<?php else : ?>
                <?php /*?><article id="post-0" class="post no-results not-found">
                    <header class="entry-header">
                        <h1 class="entry-title"><?php _e( 'Nothing Found', 'twentyeleven' ); ?></h1>
                    </header><!-- .entry-header -->

                    <div class="entry-content">
                        <p><?php _e( 'Sorry, but nothing matched your search criteria. Please try again with some different keywords.', 'twentyeleven' ); ?></p>
                        <?php get_search_form(); ?>
                    </div><!-- .entry-content -->
                </article><!-- #post-0 --><?php */?>

<?php endif; ?>

            </div><!-- #content -->
        </section><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>