[xsl] previous sibiling node value

Hi,
   I am trying to get the current node's preceding-sibling node value.
Here is my xml


  <Policy Service="response"> 
      <QMName>BRKQM</QMName>>    
      <QMNumber>01</QMNumber>      
      <QMName>BEKQM</QMName>>    
      <QMNumber>02</QMNumber>
      <RequestQueue>TEST.RSP</RequestQueue>      
   </Policy>
                 Let us suppose if my qmNumber is 02 i need to go to prevoius 
node QMName and get BEKQM.
          How can i do this .



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