Original Twenty Twelve code for header

<?php /* $header_image = get_header_image();
if ( ! empty( $header_image ) ) : ?>
    <div id="header-image-wrapper"><a href="<?php echo esc_url( home_url( '/' ) ); ?>"><img src="<?php echo esc_url( $header_image ); ?>" class="header-image" width="<?php echo get_custom_header()->width; ?>" height="<?php echo get_custom_header()->height; ?>" alt="" /></a></div>
<?php endif; */ ?>

Here is the output:

<img src="http://matulaitismission.org/wp-content/uploads/2013/01/cropped-Matulaicio-Misija-jaunimas.jpg" class="header-image" width="960" height="293" alt="" />