"target" directive not working on images

Hello,

I'm pretty new to PyDS which I found through reST which I discovered 
when using my outliner ...Leo... kind of closing the loop here with 
three Python based fantastic applications.

Anyway, I'm in a process of moving old stuff to PyDS and needed to have 
a clickable picture that would show the full size picture.
Looking at the reST documentation I tried to use the "target" directive 
without success. This is what I get :

System Message: ERROR/3 (<string>, line 10)

Error in "image" directive: unknown option: "target".

.. image:: http://natzo.com/hardware/boom01.jpg
    :height: 150
    :target: http://natzo.com/hardware/boom01.jpg
    :align: center

Is this a normal behavior ?  How can I have a clickable image under PyDS ?

Thank you
Dany