I'm seeing problems with the wedges in this post, but not in simple cases like this one.
What would happen is that I'd click on a wedge, it wouldn't change. Then I click again, and the src attribute of the image would change to "undefined" in Firebug. Not sure what that means.
Apparently you can call a function in Javascript with an incomplete parameter list. The unspecified parameters are undefined. So if you assign an unspecified paramter to an attribute, guess what -- the attribute becomes undefined.
They should have a website where they document all the non-typical things they do in JavaScript. I don't know any other Algol-like language that does it this way.
In any case, in one of my calls to the expandCollapse routine, I omitted the values for urlExpand and urlCollapse. So when I click on the item to expand it the image goes undefined. Let's see what happens if I fix it.
Yep that was it.
Madison
Milwaukee
Green Bay
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