[PHP] Themes, pictures directory

[Martin Zvarík]

Hi,
   I have a website, which uses themes.

The web tree looks like this:
   * webroot
         o *themes*
               + default
                     # images
               + red design
                     # images
         o *index.php*


Let's say I choose "red design" theme. All the pictures the theme is 
using will have URL like "www.site.com/themes/default/images/bla.jpg".

Is there a way how I can change it? So noone can see I have themes in 
that directory?

I was thinking about: ShowImage.php?blah.jpg, but that is too slow... :-/


Any help appreciated.

Martin