[Orgmode] Export ascii-images using ditaa when targeting HTML?

[Mac]

I would like to convert my ASCII-images inside my document.org before exporting
the document to HTML.

I've found this converter, ditaa, which is a java program that takes an ASCII
text file and creates a png file (http://ditaa.sourceforge.net/).

I intend to find my ASCII figure, save it as a separate text file, and run ditaa
on it. In my document.org I'll comment the ASCII-art so it won't be exported and
add a link so the image will be included in the html file.

[[file:figure_1.png]]
#+BEGIN_COMMENT
                 V,mA
                  |
               +-----+
               |40140|
               +-----+
                  |
                  |    +----+
              +--------|4561|----------> PC  
              |        +----+  
           +----+
           |4060|
           +----+
              |
           Relay Out
#+END_COMMENT

Before reinventing the wheel, anyone done anything similar, or have ideas?