Thoughts about images ...
Hi Ruth --
Yeah -- and you're working on a Saturday, and I'm working past my bedtime on a Friday!
I learned a long time ago that the gut feel of an academic is a very accurate instrument. I'm sure that your diagrams are, from a teaching perspective, an order of magnitude better than the example I was showing.
Mmmmm -- control over content and you're prepared to use a wiki <smile>. My point is about image formats and saving time .... pdf won't do that for you.
Given your speed in whizzing of diagrams -- now if you learned how to use Inkscape you would scale up your development capacity --- over time by an order of magnitude <smile>
Hey -- I need to get some sleep. Off to go camping tomorrow in Washington state -- its a long weekend.