[Proto-Scripty] Ajax.Updater insertion not working in IE

[Jason C]

I have the following piece of code being automatically created by a
Ruby on Rails function call. It works great in Firefox and Chrome, as
well as IE8, but does not work in IE9.

<form
 action="/cms/quiz_questions/auto_populate"
 id="auto_pop_questions_form"
 method="post"
 onsubmit="new Ajax.Updater(
   'quiz_questions',
   '/cms/quiz_questions/auto_populate',
   {
     asynchronous:true,
     evalScripts:true,
     insertion:'after',
     onComplete:function(request){
       toggle_hidden(&quot;search_comp&quot;, false);
       update_existing_questions();
     },
     parameters:Form.serialize(this)
   }
 );
 return false;">

If I remove the insertion parameter, then it works fine in IE9, but
then my content gets replaced instead of added to. Why doesn't this
work correctly in IE9? Or, alternatively, how can I do this AJAX call
in a different way to avoid the issue?

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