How to add an xml tag using actionscript 3?

My XML is

<imglist>
  <url>data</url>
  <title>title</title>
</imglist>

Here, I want insert <image></image> this tag. which means I need the output like

  <imglist>
    <image>
     <url>data</url>
     <title>title</title>
    </image>
  </imglist>

Any answers????