'header' twenty ten

<div id="header">
        <div id="masthead">
            <div id="branding" role="banner">
                <?php $heading_tag = ( is_home() || is_front_page() ) ? 'h1' : 'div'; ?>
                <<?php echo $heading_tag; ?> id="site-title">
                    <span>
                        <a href="<?php echo home_url( '/' ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a>
                    </span>
                </<?php echo $heading_tag; ?>>
                <div id="site-description"><?php bloginfo( 'description' ); ?></div>

                <?php
                    // Check if this is a post or page, if it has a thumbnail, and if it's a big one
                    if ( is_singular() && current_theme_supports( 'post-thumbnails' ) &&
                            has_post_thumbnail( $post->ID ) &&
                            ( /* $src, $width, $height */ $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-thumbnail' ) ) &&
                            $image[1] >= HEADER_IMAGE_WIDTH ) :
                        // Houston, we have a new header image!
                        echo get_the_post_thumbnail( $post->ID );
                    elseif ( get_header_image() ) : ?>
                        <img src="<?php header_image(); ?>" width="<?php echo HEADER_IMAGE_WIDTH; ?>" height="<?php echo HEADER_IMAGE_HEIGHT; ?>" alt="" />
                    <?php endif; ?>
            </div><!-- #branding -->

            <div id="access" role="navigation">
              <?php /*  Allow screen readers / text browsers to skip the navigation menu and get right to the good stuff */ ?>
                <div class="skip-link screen-reader-text"><a href="#content" title="<?php esc_attr_e( 'Skip to content', 'twentyten' ); ?>"><?php _e( 'Skip to content', 'twentyten' ); ?></a></div>
                <?php /* Our navigation menu.  If one isn't filled out, wp_nav_menu falls back to wp_page_menu.  The menu assiged to the primary position is the one used.  If none is assigned, the menu with the lowest ID is used.  */ ?>
                <?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary' ) ); ?>
            </div><!-- #access -->
        </div><!-- #masthead -->
    </div><!-- #header -->