nbsp;  <ie:treeitem><ie:label>2.6.2 Whales</ie:label></ie:treeitem>
       <ie:treeitem><ie:label>2.6.3 Crocodiles</ie:label></ie:treeitem>
       <ie:treeitem><ie:label>2.6.4 Sea Turtles</ie:label></ie:treeitem>
     </ie:treeitem>
     <ie:treeitem><ie:label>2.7 Late Permian</ie:label></ie:treeitem>
     <ie:treeitem><ie:label>2.8 Mesozoic</ie:label></ie:treeitem>
  </ie:treeitem>
  <ie:treeitem><ie:label>3.0 Archosaurs</ie:label>
     <ie:treeitem><ie:label>3.1 Mandibular fenestra</ie:label></ie:treeitem>
     <ie:treeitem><ie:label>3.2 Pointed Snout</ie:label></ie:treeitem>
     <ie:treeitem><ie:label>3.3 Theocodant Tooth Implantation</ie:label></ie:treeitem>
     <ie:treeitem><ie:label>3.4 Modified Ankle</ie:label></ie:treeitem>
  </ie:treeitem>
  <ie:treeitem><ie:label>4.0 Mesozoic</ie:label>
     <ie:treeitem><ie:label>4.1 Middle Animals</ie:label></ie:treeitem>
  </ie:treeitem>
</ie:tree>
<script>
// variables for drag/drop
var dragElement = null;
var dropElement = null;
var currOver = null;

// variables for expanding/collapsing
var flyCount = 5;
var msecs = 5;
var currCount = 0;

// event handler hookup
TheTree.onmousedown = preselect;
TheTree.ondragstart = dragstart;
TheTree.ondragend = dragend;
TheTree.ondragenter = dragover;
TheTree.ondragover = dragover;
TheTree.ondragend = dragend;
TheTree.ondrop = dragdrop;
document.onclick = click;

// drag/drop code

// method called as we start drag/drop
function dragstart() {
  var e;
  e = window.event.srcElement;
  if (e.tagName != "label")  
    return false;

  dragElement = e.parentElement;
}

// called as we mouse over - note that there is special handling for dragover code
// as dragleave doesn't track the toElement/fromElement as mouseover/mouseout does
function dragover() {
  if (window.event.srcElement.tagName != "treeitem")  
    return;

  if (!dragElement.contains(window.event.srcElement)) {
    if (currOver) {
      curr

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