script and xsl

Hi friends
I got this msg in my XSL file (knowing that I'm using MSXML3 parser and 
IE5): 
Microsoft VBScript runtime error Object doesn't support this property or 
method: 'node.selectSingleNode' 

And this is my code:
<?xml version="1.0"?>
<xsl:stylesheet  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
xmlns:xslscript="http://mycompany.com/mynamespace"  version="1.0">   
<msxsl:script language="vbScript" implements-prefix="xslscript"> 
   function calcul(node)
     m=Node.selectSingleNode("Sales").text
     n=node.selectSingleNode("UnitCost").text
     calcul=m*n
   end function
</msxsl:script>

And I'm calling it this way:
<xsl:value-of select="xslscript:calcul(me) "/>

What could be the problem???
Thx again :)



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