Ok, there's probably something else in my install that is not in your's. I don't really have time to hold your hand on this one, but try the following.
First thing is to check for errors in the AOLserver error log and also in Firefox's "Error Console".
Second, can you run brian2 directly in the browser and check that it's working fine (you should see the ns_log entry). It should just return raw HTML like this:
<label for="field2">Field2:</label>
<select name="field2" id="field2" multiple="multiple" >
<option value="a">Apple</option>
<option value="b">Brian</option>
<option value="c">Carrot</option>
</select>
Brian
