This extension does exactly what it says it should do. It is very easy to work with. I had some problems with installing. It didnot produce a clickable image. After I had set the plugin, tab basic, lightbox-script on 'standard' it appeared to work properly, although the lightbox-Script set itself on 'slimbox.php' again after saving. Anyway, it appeared to be an effective action.
Thanx mr. Bayer for this awsome plugin.