How to use page-number in xsl:if

hi
 
Is it possible to use the page-number in xsl:if??
 
What i tried was to insert a blank page if the current page mod 2 = 0
because i had no other idea to start a new page-sequence on an odd page.
 
<xsl:if test="fo:page-number mod 2 = 0">
    <fo:block break-after="page">
        <xsl:text>&#xA;</xsl:text>
    </fo:block>
</xsl:if>
 
I would appreciate any ideas.
 
br
Christian