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<xul xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="boom();">

<script type="text/javascript">

function boom()
{
  var XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

  var oldListbox = document.getElementById("oldListbox");
  var listitem = document.getElementById("listitem");
  var newListbox = document.createElementNS(XUL_NS, "listbox");
  var newHbox = document.createElementNS(XUL_NS, "hbox");

  oldListbox.appendChild(newListbox);
  listitem.appendChild(newHbox);

  newListbox.style.display = "inline";
  oldListbox.style.display = "block";
  newHbox.style.display = "inline";
}

</script>

<listbox id="oldListbox"><listitem id="listitem" /></listbox>

</xul>