diff --git a/wp-content/themes/twentyeleven/functions.php b/wp-content/themes/twentyeleven/functions.php
index b598d2acf8..e9d97ed276 100644
--- a/wp-content/themes/twentyeleven/functions.php
+++ b/wp-content/themes/twentyeleven/functions.php
@@ -114,7 +114,7 @@ function twentyeleven_setup() {
 	add_theme_support( 'post-thumbnails' );
 
 	// Add support for custom headers.
-	add_theme_support( 'custom-header', array(
+	$custom_header_support = array(
 		// The default header text color.
 		'default-text-color' => '000',
 		// The height and width of our custom header.
@@ -130,16 +130,28 @@ function twentyeleven_setup() {
 		'admin-head-callback' => 'twentyeleven_admin_header_style',
 		// Callback used to display the header preview in the admin.
 		'admin-preview-callback' => 'twentyeleven_admin_header_image',
-	) );
+	);
+	
+	add_theme_support( 'custom-header', $custom_header_support );
+
+	if ( ! function_exists( 'get_custom_header' ) ) {
+		// This is all for compatibility with versions of WordPress prior to 3.4.
+		define( 'HEADER_TEXTCOLOR', $custom_header_support['default-text-color'] );
+		define( 'HEADER_IMAGE', '' );
+		define( 'HEADER_IMAGE_WIDTH', $custom_header_support['width'] );
+		define( 'HEADER_IMAGE_HEIGHT', $custom_header_support['height'] );
+		add_custom_image_header( $custom_header_support['wp-head-callback'], $custom_header_support['admin-head-callback'], $custom_header_support['admin-preview-callback'] );
+		add_custom_background();
+	}
 
 	// 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( get_theme_support( 'custom-header', 'width' ), get_theme_support( 'custom-header', 'height' ), true );
+	set_post_thumbnail_size( $custom_header_support['width'], $custom_header_support['height'], true );
 
 	// Add Twenty Eleven's custom image sizes.
 	// Used for large feature (header) images.
-	add_image_size( 'large-feature', get_theme_support( 'custom-header', 'width' ), get_theme_support( 'custom-header', 'height' ), true );
+	add_image_size( 'large-feature', $custom_header_support['width'], $custom_header_support['height'], true );
 	// Used for featured posts if a large-feature doesn't exist.
 	add_image_size( 'small-feature', 500, 300 );
 
@@ -207,8 +219,9 @@ function twentyeleven_header_style() {
 	$text_color = get_header_textcolor();
 
 	// If no custom options for text are set, let's bail.
-	if ( $text_color == get_theme_support( 'custom-header', 'default-text-color' ) )
+	if ( $text_color == HEADER_TEXTCOLOR )
 		return;
+		
 	// If we get this far, we have custom styles. Let's do this.
 	?>
 	<style type="text/css">
@@ -269,7 +282,7 @@ function twentyeleven_admin_header_style() {
 	}
 	<?php
 		// If the user has set a custom color for the text use that
-		if ( get_header_textcolor() != get_theme_support( 'custom-header', 'default-text-color' ) ) :
+		if ( get_header_textcolor() != HEADER_TEXTCOLOR ) :
 	?>
 		#site-title a,
 		#site-description {
diff --git a/wp-content/themes/twentyeleven/header.php b/wp-content/themes/twentyeleven/header.php
index 9b762086a1..59b6d3b140 100644
--- a/wp-content/themes/twentyeleven/header.php
+++ b/wp-content/themes/twentyeleven/header.php
@@ -79,8 +79,15 @@
 				// Check to see if the header image has been removed
 				$header_image = get_header_image();
 				if ( $header_image ) :
-					$header_image_width  = get_custom_header()->width;
-			?>
+					// Compatibility with versions of WordPress prior to 3.4.
+					if ( function_exists( 'get_custom_header' ) ) {
+						// We need to figure out what the minimum width should be for our featured image.
+						// This result would be the suggested width if the theme were to implement flexible widths.
+						$header_image_width = get_theme_support( 'custom-header', 'width' );
+					} else {
+						$header_image_width = HEADER_IMAGE_WIDTH;
+					}
+					?>
 			<a href="<?php echo esc_url( home_url( '/' ) ); ?>">
 				<?php
 					// The header image
@@ -90,8 +97,17 @@
 							$image[1] >= $header_image_width ) :
 						// Houston, we have a new header image!
 						echo get_the_post_thumbnail( $post->ID, 'post-thumbnail' );
-					else : ?>
-					<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo get_custom_header()->height; ?>" alt="" />
+					else :
+						// Compatibility with versions of WordPress prior to 3.4.
+						if ( function_exists( 'get_custom_header' ) ) {
+							$header_image_width  = get_custom_header()->width;
+							$header_image_height = get_custom_header()->height;
+						} else {
+							$header_image_width  = HEADER_IMAGE_WIDTH;
+							$header_image_height = HEADER_IMAGE_HEIGHT;
+						}
+						?>
+					<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo $header_image_height; ?>" alt="" />
 				<?php endif; // end check for featured image or standard header ?>
 			</a>
 			<?php endif; // end check for removed header image ?>
diff --git a/wp-content/themes/twentyeleven/showcase.php b/wp-content/themes/twentyeleven/showcase.php
index c91ebaca04..f5d2a3eeb0 100644
--- a/wp-content/themes/twentyeleven/showcase.php
+++ b/wp-content/themes/twentyeleven/showcase.php
@@ -66,8 +66,12 @@ get_header(); ?>
 					 */
 					$counter_slider = 0;
 
-					$header_image_width  = get_theme_support( 'custom-header', 'width' );
-					?>
+					// Compatibility with versions of WordPress prior to 3.4.
+					if ( function_exists( 'get_custom_header' ) )
+						$header_image_width = get_theme_support( 'custom-header', 'width' );
+					else
+						$header_image_width = HEADER_IMAGE_WIDTH;
+				?>
 
 				<div class="featured-posts">
 					<h1 class="showcase-heading"><?php _e( 'Featured Post', 'twentyeleven' ); ?></h1>
diff --git a/wp-content/themes/twentyten/functions.php b/wp-content/themes/twentyten/functions.php
index 51596292f5..696ff15d87 100644
--- a/wp-content/themes/twentyten/functions.php
+++ b/wp-content/themes/twentyten/functions.php
@@ -101,7 +101,7 @@ function twentyten_setup() {
 
 	// The custom header business starts here.
 
-	add_theme_support( 'custom-header', array(
+	$custom_header_support = array(
 		// The default image to use.
 		// The %s is a placeholder for the theme template directory URI.
 		'default-image' => '%s/images/headers/path.jpg',
@@ -114,12 +114,25 @@ function twentyten_setup() {
 		'header-text' => false,
 		// Callback for styling the header preview in the admin.
 		'admin-head-callback' => 'twentyten_admin_header_style',
-	) );
+	);
+	
+	add_theme_support( 'custom-header', $custom_header_support );
+	
+	if ( ! function_exists( 'get_custom_header' ) ) {
+		// This is all for compatibility with versions of WordPress prior to 3.4.
+		define( 'HEADER_TEXTCOLOR', '' );
+		define( 'NO_HEADER_TEXT', true );
+		define( 'HEADER_IMAGE', $custom_header_support['default-image'] );
+		define( 'HEADER_IMAGE_WIDTH', $custom_header_support['width'] );
+		define( 'HEADER_IMAGE_HEIGHT', $custom_header_support['height'] );
+		add_custom_image_header( '', $custom_header_support['admin-head-callback'] );
+		add_custom_background();
+	}
 
 	// We'll be using post thumbnails for custom header images on posts and pages.
 	// We want them to be 940 pixels wide by 198 pixels tall.
 	// Larger images will be auto-cropped to fit, smaller ones will be ignored. See header.php.
-	set_post_thumbnail_size( get_theme_support( 'custom-header', 'width' ), get_theme_support( 'custom-header', 'height' ), true );
+	set_post_thumbnail_size( $custom_header_support['width'], $custom_header_support['height'], true );
 
 	// ... and thus ends the custom header business.
 
diff --git a/wp-content/themes/twentyten/header.php b/wp-content/themes/twentyten/header.php
index d24663f230..50cb37589d 100644
--- a/wp-content/themes/twentyten/header.php
+++ b/wp-content/themes/twentyten/header.php
@@ -66,22 +66,33 @@
 				<div id="site-description"><?php bloginfo( 'description' ); ?></div>
 
 				<?php
+					// Compatibility with versions of WordPress prior to 3.4.
+					if ( function_exists( 'get_custom_header' ) ) {
+						// We need to figure out what the minimum width should be for our featured image.
+						// This result would be the suggested width if the theme were to implement flexible widths.
+						$header_image_width = get_theme_support( 'custom-header', 'width' );
+					} else {
+						$header_image_width = HEADER_IMAGE_WIDTH;
+					}
+
 					// 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] >= get_theme_support( 'custom-header', 'width' ) ) :
+							$image[1] >= $header_image_width ) :
 						// Houston, we have a new header image!
 						echo get_the_post_thumbnail( $post->ID );
-					elseif ( get_header_image() ) :	
+					elseif ( get_header_image() ) :
+						// Compatibility with versions of WordPress prior to 3.4.
 						if ( function_exists( 'get_custom_header' ) ) {
-							$header_width  = get_custom_header()->width;
-							$header_height = get_custom_header()->height;
+							$header_image_width  = get_custom_header()->width;
+							$header_image_height = get_custom_header()->height;
 						} else {
-							$header_height = $header_width = '';
+							$header_image_width  = HEADER_IMAGE_WIDTH;
+							$header_image_height = HEADER_IMAGE_HEIGHT;
 						}
-						?>
-						<img src="<?php header_image(); ?>" width="<?php echo $header_width; ?>" height="<?php echo $header_height; ?>" alt="" />
+					?>
+						<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo $header_image_height; ?>" alt="" />
 					<?php endif; ?>
 			</div><!-- #branding -->