Different header on first page (xsl:fo)?

I really need to have a different fo:region-before for the first page,
but I have no idea how to do that, can I perhabs somehow access
the current page number?

<xsl:if test='pagenumber=1'>
	<fo:block>Do this!</fo:block>
</xsl:if>
<xsl:if test='pagenumber!=1'>
	<fo:block>Do that!</fo:block>
</xsl:if>