What is the fastest possible xsl style sheet to add another <box> node under <boxes> ?   

What is the fastest possible xsl style sheet to add another <box> node under 
<boxes> ?

<foo>
 <car></car>
 <boxes>
  <box id="234" />
  <box id="75" />
 </boxes>
</foo>

here is what i want it to look like after the xsl adds another box node:

<foo>
 <car></car>
 <boxes>
  <box id="89">
   <bar id="1" />
   <bar id="35" />
  </box>
  <box id="234" />
  <box id="75" />
 </boxes>
</foo>

notice that the node i want to insert under /foo/boxes is:

  <box id="89">
   <bar id="1" />
   <bar id="35" />
  </box>

and i want it to appear at the top of the list, befor the other two <box> 
nodes

date: Wed, 31 Oct 2007 19:44:14 -0700   author:   DR