Dynatree - Init from UL-elements

HTML

<script src="http://dynatree.googlecode.com/svn/trunk/src/jquery.dynatree.js"></script>
<link rel="stylesheet" href="http://wwwendt.de/tech/dynatree/src/skin-vista/ui.dynatree.css">
<div id="tree">
    <ul id="treeData" style="display: block;">
      <li id="id1" title="Look, a tool tip!">item1 with key and tooltip
      <li id="id2">item2
      <li id="id3" class="folder">Folder with some children
        <ul>
          <li id="id3.1">Sub-item 3.1
            <ul>
              <li id="id3.1.1">Sub-item 3.1.1
              <li id="id3.1.2">Sub-item 3.1.2
            </ul>
          <li id="id3.2">Sub-item 3.2
            <ul>
              <li id="id3.2.1">Sub-item 3.2.1
              <li id="id3.2.2">Sub-item 3.2.2
            </ul>
        </ul>
      <li id="id4" class="expanded">Document with some children (expanded on init)
        <ul>
          <li id="id4.1"  class="active focused">Sub-item 4.1 (active and focus on init)
            <ul>
              <li id="id4.1.1">Sub-item 4.1.1
              <li id="id4.1.2">Sub-item 4.1.2
            </ul>
          <li id="id4.2">Sub-item 4.2
            <ul>
              <li id="id4.2.1">Sub-item 4.2.1
              <li id="id4.2.2">Sub-item 4.2.2
            </ul>
        </ul>
    </ul>
  </div>

JavaScript

$(function(){
      $("#tree").dynatree({
			checkbox: true
		
    // using default options
      });
});