Trouble removing dup elements based on attributes

Hi,

I just started using XSLT today and I'm trying to figure out how to get rid 
of some duplicated elements.  I know that I need to do something to the 
"XXX" template but I am not sure what to do.
I've tried this for the XXX template but it does not work:
<xsl:template mode="XXX" match="attrib[(_at_)name='Names']/rs/row">
   <xsl:if test="not(@firstname = 
preceding::attrib[(_at_)name='Names']/rs/row/@firstname)">
       <xsl:element name="ns:name">
           <xsl:value-of select="@firstname"/>
       </xsl:element>
   </xsl:if>
 </xsl:template>


Thanks in advance for any help.




----------------------
My XSL
----------------------

<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0" xmlns:ns="http://w.ns.c/ns/prod/";>
   <xsl:template match="/">
       <ns:Products>
           <xsl:apply-templates/>
       </ns:Products>
   </xsl:template>

   <xsl:template match="product">
       <xsl:element name="ns:Product">
           <xsl:element name="ns:Names">
               <xsl:apply-templates mode="XXX" 
select="attrib[(_at_)name='Names']/rs/row"/>
           </xsl:element>
       </xsl:element>
   </xsl:template>

   <xsl:template mode="XXX" match="attrib[(_at_)name='Names']/rs/row">
       <xsl:element name="ns:name">
           <xsl:value-of select="@firstname"/>
       </xsl:element>
   </xsl:template>
</xsl:transform>


----------------------------------------------------
Input XML :
----------------------------------------------------

<prods>
   <product>
       <attrib name="P">product 1</attrib>
       <attrib name="Names">
           <rs>
               <row firstname="Bill"/>
               <row firstname="Bill"/>
           </rs>
       </attrib>
   </product>
   <product>
       <attrib name="P">product 2</attrib>
       <attrib name="Names">
           <rs>
               <row firstname="Sam"/>
               <row firstname="Ron"/>
               <row firstname="Sam"/>
               <row firstname="Ron"/>
           </rs>
       </attrib>
   </product>
   <product>
       <attrib name="P">product 3</attrib>
       <attrib name="Names">
           <rs>
               <row firstname="Ron"/>
               <row firstname="Sam"/>
               <row firstname="Joe"/>
               <row firstname="Sam"/>

           </rs>
       </attrib>
   </product>
</prods>

----------------------------------------------------
This is the OUTPUT that I want (note no name dups):
----------------------------------------------------

<ns:Products xmlns:ns="http://w.ns.c/ns/prod/";>
   <ns:Product>
       <ns:Names>
           <ns:name>Bill</ns:name>
       </ns:Names>
   </ns:Product>
   <ns:Product>
       <ns:Names>
           <ns:name>Sam</ns:name>
           <ns:name>Ron</ns:name>
       </ns:Names>
   </ns:Product>
   <ns:Product>
       <ns:Names>
           <ns:name>Ron</ns:name>
           <ns:name>Joe</ns:name>
           <ns:name>Sam</ns:name>
       </ns:Names>
   </ns:Product>
</ns:Products>


----------------------------------------------------
But this is the OUTPUT that I get (note the name dupes):
----------------------------------------------------
<ns:Products xmlns:ns="http://w.ns.c/ns/prod/";>
   <ns:Product>
       <ns:Names>
           <ns:name>Bill</ns:name>
           <ns:name>Bill</ns:name>
       </ns:Names>
   </ns:Product>
   <ns:Product>
       <ns:Names>
           <ns:name>Sam</ns:name>
           <ns:name>Ron</ns:name>
           <ns:name>Sam</ns:name>
           <ns:name>Ron</ns:name>
       </ns:Names>
   </ns:Product>
   <ns:Product>
       <ns:Names>
           <ns:name>Ron</ns:name>
           <ns:name>Sam</ns:name>
           <ns:name>Joe</ns:name>
           <ns:name>Sam</ns:name>
       </ns:Names>
   </ns:Product>
</ns:Products>

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