Rotating headers support for Delicate theme

add_action( 'after_setup_theme', 'delicate_setup' );

if ( ! function_exists( 'delicate_setup' ) ):
/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * @uses add_theme_support() To add support for post thumbnails.
 * @uses add_custom_image_header() To add support for a custom header.
 */
function delicate_setup() {
    // This theme uses Featured Images (also known as post thumbnails) for per-post/per-page Custom Header images
    add_theme_support( 'post-thumbnails' );

    // The next four constants set how Delicate supports custom headers.

    // The default header text color
    define( 'HEADER_TEXTCOLOR', '000' );

    // By leaving empty, we allow for random image rotation.
    define( 'HEADER_IMAGE', '' );

    // The height and width of your custom header.
    // Add a filter to delicate_header_image_width and delicate_header_image_height to change these values.
    define('HEADER_IMAGE_WIDTH', 969);
    define('HEADER_IMAGE_HEIGHT', 213);

    // We'll be using post thumbnails for custom header images on posts and pages.
    // We want them to be the size of the header image that we just defined
    // Larger images will be auto-cropped to fit, smaller ones will be ignored. See header.php.
    set_post_thumbnail_size( HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT, true );

    // Turn on random header image rotation by default.
    add_theme_support( 'custom-header', array( 'random-default' => true ) );

    // Add a way for the custom header to be styled in the admin panel that controls
    // custom headers. See delicate_admin_header_style(), below.
    add_custom_image_header( 'delicate_header_style', 'delicate_admin_header_style', 'delicate_admin_header_image' );

    // Default custom headers packaged with the theme. %s is a placeholder for the theme template directory URI.
    register_default_headers( array(
        'green-header' => array(
            'url' => '%s/images/header/header.jpg',
            'thumbnail_url' => '%s/images/header/header.jpg',
            'description' => 'Зелёный'
        ),
        'blue-header' => array(
            'url' => '%s/images/header/headers.jpg',
            'thumbnail_url' => '%s/images/header/headers.jpg',
            'description' => 'Синий'
        )
    ) );
}
endif; // delicate_setup

if ( ! function_exists( 'delicate_header_style' ) ) :
/**
 * Styles the header image and text displayed on the blog
 */
function delicate_header_style() {

    // If no custom options for text are set, let's bail
    // get_header_textcolor() options: HEADER_TEXTCOLOR is default, hide text (returns 'blank') or any hex value
    if ( HEADER_TEXTCOLOR == get_header_textcolor() )
        return;
    // If we get this far, we have custom styles. Let's do this.
    ?>
    <style type="text/css">
    <?php
        // Has the text been hidden?
        if ( 'blank' == get_header_textcolor() ) :
    ?>
        #site-title,
        #site-description {
            position: absolute !important;
            clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
            clip: rect(1px, 1px, 1px, 1px);
        }
    <?php
        // If the user has set a custom color for the text use that
        else :
    ?>
        #site-title a,
        #site-description {
            color: #<?php echo get_header_textcolor(); ?> !important;
        }
    <?php endif; ?>
    </style>
    <?php
}
endif; // delicate_header_style

if ( ! function_exists( 'delicate_admin_header_style' ) ) :
/**
 * Styles the header image displayed on the Appearance > Header admin panel.
 *
 * Referenced via add_custom_image_header() in delicate_setup().
 */
function delicate_admin_header_style() {
?>
    <style type="text/css">
    .appearance_page_custom-header #headimg {
        border: none;
    }
    #headimg h1,
    #desc {
        font-family: "Helvetica Neue", Arial, Helvetica, "Nimbus Sans L", sans-serif;
    }
    #headimg h1 {
        margin: 0;
    }
    #headimg h1 a {
        font-size: 32px;
        line-height: 36px;
        text-decoration: none;
    }
    #desc {
        font-size: 14px;
        line-height: 23px;
        padding: 0 0 3em;
    }
    <?php
        // If the user has set a custom color for the text use that
        if ( get_header_textcolor() != HEADER_TEXTCOLOR ) :
    ?>
        #site-title a,
        #site-description {
            color: #<?php echo get_header_textcolor(); ?>;
        }
    <?php endif; ?>
    #headimg img {
        max-width: 1000px;
        height: auto;
        width: 100%;
    }
    </style>
<?php
}
endif; // delicate_admin_header_style

if ( ! function_exists( 'delicate_admin_header_image' ) ) :
/**
 * Custom header image markup displayed on the Appearance > Header admin panel.
 *
 * Referenced via add_custom_image_header() in delicate_setup().
 */
function delicate_admin_header_image() { ?>
    <div id="headimg">
        <?php
        if ( 'blank' == get_theme_mod( 'header_textcolor', HEADER_TEXTCOLOR ) || '' == get_theme_mod( 'header_textcolor', HEADER_TEXTCOLOR ) )
            $style = ' style="display:none;"';
        else
            $style = ' style="color:#' . get_theme_mod( 'header_textcolor', HEADER_TEXTCOLOR ) . ';"';
        ?>
        <h1><a id="name"<?php echo $style; ?> onclick="return false;" href="<?php echo esc_url( home_url( '/' ) ); ?>"><?php bloginfo( 'name' ); ?></a></h1>
        <div id="desc"<?php echo $style; ?>><?php bloginfo( 'description' ); ?></div>
        <?php $header_image = get_header_image();
        if ( ! empty( $header_image ) ) : ?>
            <img src="<?php echo esc_url( $header_image ); ?>" alt="" />
        <?php endif; ?>
    </div>
<?php }
endif; // delicate_admin_header_image