I'm attempting to implement the custom header API into a child theme to allow users to upload their own header in the back end. I've almost got it. However, I'm struggling with one issue in the functions.php file. There is one line that sets the default image
define('HEADER_IMAGE', '%s/images/image.jpg'); // %s is theme dir uri, set a default image
The "%s" sets the directory to "thematic" and not my child theme directory. Anyone know how to get it to point to my child theme directory to locate the image?