output CDATA in xml using xsl

Hello
I am trying to make a xsl document that converts one xml document into 
another, but  have run into some trouble.
I have this document:
<ads>
<ad>
  <hello>world</hello>
  <paragraph>Some <bold>html</bold> formatted text</paragraph>
  <paragraph>Another line of <bold>html</bold></paragraph>
</ad>
</ads>

And I want this out:
<ads>
<ad>
  <hello>world</hello>
  <htmlcontent>
  <![CDATA[
      <p>Som Some <b>html</b> formatted text<p>
      <p>Another line of <b>html</b></p>
  ]]>
  </htmlcontent>
</ad>
</ads>

I have tried setting <xsl:output cdata-section-elements="htmlcontent"> 
but that did not help me?
Regards,
Thomas Rasmussen


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