gistfile1.xml

<lift:surround with="default" at="content">

  <lift:comet type="Chat">
    <h3>welcome to lift chat</h3>
    <ul id="ul_dude">
      <chat:line></chat:line>
    </ul>
    <lift:form>
      <chat:input/>
      <input type="submit" value="chat"/>
    </lift:form>
  </lift:comet>

</lift:surround>