how compare two nodes

Hi,
I have a problem with XSL sintax. I used this stylesheet <xsl:stylesheet
xmlns:xsl="http://www.w3.org/TR/WD-xsl">
because otherwise javascript included in XSL don't work.
I would compare tag Tit_Num with all tag Rev_NumCollegato.
If Tit_Num  value = Rev_NumCollegato value,  I would view a specific template.
How can I do it?

Thanks a lot in advance.
Regards
Anna.
---------------------------------------------------------

<Mandato_Reversale>
<Mandato>
  <Estremi_Titolo>
   <Tit_CodF>EM</Tit_CodF>
   <Tit_DescrF>Emissione mandato</Tit_DescrF>
   <Tit_Num>20005</Tit_Num>
   <Tit_Data>20020111</Tit_Data>
   <Tit_Oggetto>test test</Tit_Oggetto>
   </Estremi_Titolo>
</Mandato>
<Reversale>
        <Rev_EstremiTitolo>
           <Rev_CodF>ER</Rev_CodF>
           <Rev_DescrF>Emissione reversale</Rev_DescrF>
           <Rev_Num>1</Rev_Num>
           <Rev_Qualificatore>P</Rev_Qualificatore>
           <Rev_Data>20020111</Rev_Data>
           <Rev_OggettoEntrata/>
           <Rev_CodEsattoriale>1040</Rev_CodEsattoriale>
           <Rev_CodRitenuta>ciao</Rev_CodRitenuta>
           <Rev_DescrRitenuta/>
           <Rev_NumCollegato>20005</Rev_NumCollegato>
           <Rev_DataCollegato>20020111</Rev_DataCollegato>
        </Rev_EstremiTitolo>
</Reversale>
<Reversale>
        <Rev_EstremiTitolo>
           <Rev_CodF>ER</Rev_CodF>
           <Rev_DescrF>Emissione reversale</Rev_DescrF>
           <Rev_Num>2</Rev_Num>
           <Rev_Qualificatore>P</Rev_Qualificatore>
           <Rev_Data>20020111</Rev_Data>
           <Rev_OggettoEntrata/>
           <Rev_CodEsattoriale>1040</Rev_CodEsattoriale>
           <Rev_CodRitenuta>ciao</Rev_CodRitenuta>
           <Rev_DescrRitenuta/>
           <Rev_NumCollegato>20006</Rev_NumCollegato>
           <Rev_DataCollegato>20020111</Rev_DataCollegato>
        </Rev_EstremiTitolo>
</Reversale>

</Mandato_Reversale>




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