Hi Chao,
Here's a second org-babel method, and a third method using org-fstree by
Andreas Burtzlaff.
http://orgmode.org/worg/org-contrib/babel/
http://burtzlaff.de/org-fstree/
Dan
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* babel
#+begin_src sh :results output org :var
This would require some work on your part,
but it shouldn't be hard to use Org-babel and your favorite scripting
language to automatically generate the html required to display an
image, for each file in a directory of photographs, and then use
the :results html setting to drop the resulting html
