To pass parameters to function

Hi.
I'm tring to pass two params to this function

	function alignLeft(sValue,nSpaces)
	   alignLeft=left(sValue+space(nSpaces),nSpaces)
	end function

in this way

	<xsl:variable name="sVal" select='XXXXX'/>
	<xsl:value-of select="xsl:alignLeft($sVal,10)"/>

but MSXML3 give me this error

	VBScript Run-Time error
	Wrong number of arguments or invalid property setting 

If I try following, works

	<xsl:value-of select="xsl:alignLeft('XXXXX',10)"/>

I think to wrong use of xsl:variable.
Who help me?

Bye, Nicola

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