> First, how do I check what arguments downloadUrlAdd() returns?

It's code that you wrote, so you just have to read it:
      function downloadUrlAdd(url, callback) {
you pass some function to downloadUrlAdd
      callback(request.responseText, request.status);
when it's ready, it calls that function that you passed in with the
value of those two arguments at the time.

The error I get upon clicking "Save & Close" is
     document.getElementById("message") has no properties
which should give you a clue, where in your page is <div id='message'>

You might want to check in other browsers, I think the layout is broke
in FF2 (I only see a map) and IE6 (I see Gutenburg headings but map is
broken).  Maybe those iframes need some size.

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