http://wordpress.stackexchange.com/a/44044/6344

<!-- search.php -->

<?php get_header(); ?>
<?php get_sidebar(); ?>
<div id="content2">
    <?php if (have_posts()) : ?>

        <?php if ($s) : ?>
            <p class="info" style="margin-top: 0;">Search results for <em>&#8216;<?php echo $s ?>&#8217;</em></p>
        <?php else : ?>
            <p class="info" style="margin-top: 0;">Search results:</p>
        <?php endif; ?>

        <?php while ( have_posts() ) : the_post(); ?>
            <div class="post" id="post-<?php the_ID(); ?>">
                <?php
                    switch ( get_post_type() ) {
                        case "species" :
                            get_template_part('list', 'species');
                            break;
                        case "glossary" :
                            get_template_part('list', 'glossary');
                            break;
                        default :
                            get_template_part('list', 'index');
                            break;
                    }
                ?>
            </div>
        <?php endwhile; ?>

        <?php next_posts_link('<span class="nextpost">Next</span>' ); ?>
        <?php previous_posts_link('<span class="previouspost">Back</span>' ); ?>

    <?php else : ?>

        <?php get_template_part( 'notfound' ); ?>

    <?php endif; ?>
</div>
<?php get_footer(); ?>
</div>
</body>
</html>

<!-- searchform.php -->

<?php
    $search_query = get_search_query();
    if (!$search_query) {
        $search_query = "SEARCH";
    }
?>
<form id="topbar_search" action="<?php echo home_url( '/' ); ?>" method="post">
    <p>SEARCH</p>
    <input type="text" size="50" value="<?php echo $search_query; ?>" name="s" id="s" class="topbar_longinput default-value" />
    <input type="submit" value="GO" class="topbar_submit" />
    <p class="tinylinks"><a href="#1">advanced search</a></p>
</form>

<!-- searchform-glossary.php -->
<div class="glossary" href="#">
    GLOSSARY &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<strong class="dkblue">&#9660;</strong>
    <span>
        <form action="<?php echo home_url( '/glossary/' ); ?>" method="get">
            <p style="font-size:12px;">SEARCH<strong class="dkblue">GLOSSARY</strong></p>
            <input type="text" name="s" value="" />
            <input type="submit" value="GO" class="glossary_submit" />
        </form>
        <div class="glossaryletters">
            <a href="/dev/glossary/a/">A</a>
            <a href="/dev/glossary/b/">B</a>
            <a href="/dev/glossary/c/">C</a>
            <a href="/dev/glossary/d/">D</a>
            <a href="/dev/glossary/e/">E</a>
            <a href="/dev/glossary/f/">F</a>
            <a href="/dev/glossary/g/">G</a>
            <a href="/dev/glossary/h/">H</a>
            <a href="/dev/glossary/i/">I</a>
            <a href="/dev/glossary/j/">J</a>
            <a href="/dev/glossary/k/">K</a>
            <a href="/dev/glossary/l/">L</a>
            <a href="/dev/glossary/m/">M</a>
            <a href="/dev/glossary/n/">N</a>
            <a href="/dev/glossary/o/">O</a>
            <a href="/dev/glossary/p/">P</a>
            <a href="/dev/glossary/q/">Q</a>
            <a href="/dev/glossary/r/">R</a>
            <a href="/dev/glossary/s/">S</a>
            <a href="/dev/glossary/t/">T</a>
            <a href="/dev/glossary/u/">U</a>
            <a href="/dev/glossary/v/">V</a>
            <a href="/dev/glossary/w/">W</a>
            <a href="/dev/glossary/x/">X</a>
            <a href="/dev/glossary/y/">Y</a>
            <a href="/dev/glossary/z/">Z</a>
            <div class="clear"></div>
        </div>
    </span>
</div>

<!-- searchform-profiles.php -->

<h1 class="profilesearch">PROFILE<span class="white">SEARCH</span></h1>
<form id="profilesearch" action="<?php echo home_url( '/species/' ); ?>" method="get">
    <input type="text" size="50" class="default-value" value="SEARCH" name="s" />
    <input type="submit" value="GO" class="profilesearch_submit" />
    <!-- <p class="tinysearch"><a href="/dev/advanced-search/">ADVANCED SEARCH</a></p> -->
    <input type="checkbox" name="showthumbnails" id="showthumbnails" class="checkbox" <?php if ($_POST["showthumbnails"] == "on") { echo 'checked="checked" '; } ?>/><label for="showthumbnails">HIDE THUMBNAILS</label>
</form>

<!-- searchresults.php -->

<?php global $args; ?>

<?php query_posts( $args ); ?>

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

    <?php if ($s) : ?>
        <p class="info" style="margin-top: 0;">Search results for <em>&#8216;<?php echo $s ?>&#8217;</em></p>
    <?php else : ?>
        <p class="info" style="margin-top: 0;">Search results:</p>
    <?php endif; ?>

    <?php while ( have_posts() ) : the_post(); ?>
        <div class="post" id="post-<?php the_ID(); ?>">
            <?php
                switch ( get_post_type() ) {
                    case "species" :
                        get_template_part('list', 'species');
                        break;
                    case "glossary" :
                        get_template_part('list', 'glossary');
                        break;
                    default :
                        get_template_part('list', 'index');
                        break;
                }
            ?>
        </div>
    <?php endwhile; ?>

    <?php next_posts_link('<span class="nextpost">Next</span>' ); ?>
    <?php previous_posts_link('<span class="previouspost">Back</span>' ); ?>

<?php else : ?>

    <?php get_template_part( 'notfound' ); ?>

<?php endif; ?>