twentytwelve_custom_header_setup()

22function twentytwelve_custom_header_setup() {23	$args = array(24		// Text color and image (empty to use none).25		'default-text-color'     => '515151',26		'default-image'          => '',27 28		// Set height and width, with a maximum value for the width.29		'height'                 => 250,30		'width'                  => 960,31		'max-width'              => 2000,32 33		// Support flexible height and width.34		'flex-height'            => true,35		'flex-width'             => true,36 37		// Random image rotation off by default.38		'random-default'         => false,39 40		// Callbacks for styling the header and the admin preview.41		'wp-head-callback'       => 'twentytwelve_header_style',42		'admin-head-callback'    => 'twentytwelve_admin_header_style',43		'admin-preview-callback' => 'twentytwelve_admin_header_image',44	);45 46	add_theme_support( 'custom-header', $args );47}