This mod is for a personal column , originally as [_sidebar_left.php] in the skin directory. However as I want different data for separate blogs whilst using the same skin I have

1. Created a unique file e.g [elf_sidebar_left.php] for each blog in the relevant skin directory and
2. prefixed the calling include php code with [$Blog->name]
i.e. In each of {posts.main.php, page.main.php, single.main.php}
imediately after
skin_include( '_body_header.inc.php' );
I have inserted
skin_include( $Blog->name . '_sidebar_left.inc.php' );
3. There is also relevant css code in each blogs [media/blogs/***/style.css] for [***_sidebar_left.php] and it's objects.