Following up on a very good suggestion by Roger Sperberg, I added two webfonts to the Khmer picker and arranged the font selection list so that you can see which fonts are available on your Mac OS X or Windows7 system.
The webfonts make it possible to use the picker on an iPad or other device that doesn’t have a Khmer font installed. I added two webfonts because one worked on my iPad and the other didn’t, and it was vice versa on my Snow Leopard Macbook.
I also added an HTML5 placeholder for the output box. (I’m wishing you could style that differently from the standard content – and wishing that markup designers would think about this sort of thing and stop using attributes for natural language text…).
You can find the Khmer picker at http://rishida.net/scripts/pickers/khmer/