[Rails] Master-Details with Ajax

[purplehaze]

I have in my rhtml file an master-detail data structur

<ul id="master">
  <li><%= link_to_remote 'aaa', :update=>'details'... %></li>
  <li><%= link_to_remote 'bbb', :update=>'details'... %></li>
  <li><%= link_to_remote 'ccc', :update=>'details'... %></li>
  ...
</ul>

<div id="details"></div>

In details goes show, edit and another actions.
If I update somewhat in details I will be sure that it goes updated in 
master too.

Also I put

<script>
new Ajax.Updater('master_item_id', "/organization/get_tree_node/org_id", 
{asynchronous:true, evalScripts:true});
</script>

to bottom of my updated detail

In Firefox master-item all works perfect, but IE says 'Unknown 
JavaScript Error'

Any Ideas to this problem?

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