[Plugin: Lightbox Gallery] Troubles with $plugin_dir

Hi!

If the plugin directory is a symbolic link to another one, the $plugin_dir variable gets an incorrect value.
I’ve got a several sites with common plugin directory, like this:
/my_home/site1.com/
/my_home/site2.com/
/my_home/site3.com/
…
/my_home/plugins/

And all ‘/my_home/site*.com/wp-content/plugins/’ directories is just a symlinks to ‘/my_home/plugins/’

In this case, the $plugin_dir variable gets value like this: ‘/my_home/plugins/lightbox-gallery/’ instead of ‘lightbox-gallery’.
The solution, I’ve found, is to define it this way:

if ( !defined('WP_PLUGIN_DIR') )
                $plugin_dir = basename( str_replace( ABSPATH, '', dirname(__FILE__) ) );
        else
                $plugin_dir = basename( dirname( plugin_basename(__FILE__) ) );

http://wordpress.org/extend/plugins/lightbox-gallery/