change a symbol's "instance of" property to another symbol?

Flashers:

>>> I have inherited a flash file with the wrong "instance of" value in the
>>> Properties panel for the instance of one symbols. How should I change
>>> that to the correct value, /in-situ/? Back-doors, internal ActionScript,
>>> decoding raw FLA files, all are preferable to deleting these objects and
>>> breaking all their links!
>>
>> It's the Swap button...
>
> Now how do I do it for each of a long sequence of keyframes?

Using the following feeb attempt at JSFL:

var the_doc = flash.getDocumentDOM();
var q = the_doc.library.findItemIndex("art/man_obj");
var man_obj = the_doc.library.items[q];
var q = the_doc.library.findItemIndex("art/swords");
var swords = the_doc.library.items[q];

var tl = man_obj.timeline;

  for(var l=0; l < tl.layers.length; l++) {
   var the_layer = tl.layers[l];
   if (the_layer.name == 'sword') {
   fl.trace(the_layer.name);
   for(var f=0; f < the_layer.frames.length; f++) {
    var the_frame = the_layer.frames[f];
     for (var e = the_frame.elements.length;  e--;) {
     var elem = the_frame.elements[e];
     if (elem.elementType == 'instance' &&
       elem.instanceType == 'symbol' &&
        elem.libraryItem.name == 'art/sword_1')
     {
      elem.libraryItem = swords;
     }
    }
   }
   }
  }

Code tips or links to similar published libraries welcome!

-- 
  Phlip
  http://www.oreilly.com/catalog/9780596510657/
  "Test Driven Ajax (on Rails)"
  assert_xpath, assert_javascript, & assert_ajax 

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