XML to XML using XSL: help

I have an XML like this. 

<Criteria>
 <Messages Code="SSS" Message_Text="Congrats!" /> 
 <Messages Code="JJJ" Message_Text="Bad Luck"/> 
<Criteria>

Can someone help me in transforming into the following
using XSL. I want to use XSL and transform this into
XML like below.

<Criteria>
 <Messages>
  <Message code="APF">Congrats!</Message> 
  <Message code="JJJ">Bad Luck!</Message>
 </Messages>
</Criteria>

Appreciate any help. Thanks in Advance.
Nischal

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