// transforms a relative image path into an absolute one for running timthumb on a parent WP multisite blog, which has been populated by the sitewide tags plugin
function dyn_getimagepath($img_src) {
if ($post_id == null) {
global $post;
$post_id = $post->ID;
}
global $post_blog_id;
global $wpdb;
$post_blog_id = get_post_meta($post->ID, 'blogid', true) ;
if (isset($post_blog_id) && $post_blog_id > 0) {
$imageParts = explode('/files/', $img_src);
if (isset($imageParts[1])) {
$img_src = '/wp-content/blogs.dir/' . $post_blog_id . '/files/' . $imageParts[1];
}
}
return $img_src;
}