Use Featured Image of Post as Header Image
Not sure I understand your question completely hakre but here is the code that shows the featured image for twenty-ten in header.php.The image sizing is defined in the functions.php file. It also uses a function called http://codex.wordpress.org/Function_Reference/get_header_image. <?php // Check if this is a post or page, if it has a thumbnail, and if it’s … Read more