Header customization

[Pool 475-1 FRD TE-N <Pool475-1.FRDTE-N@zf.com>]

Hi,

I'm trying to customize the header for FO output. If the double.sided param
is set to 1, the center position changes after each page. If double.sided is
set to 0, I want the header to be the same on each page - but this doesn't
work, sometimes the left part of the header is the bigger one ... sometimes
it is the right one. What am I doing wrong?

Regards,
Bjoern

--- snip ---
  <xsl:param name="header.column.widths" select="'7 1 2'" />

  <xsl:template name="header.content">
    <xsl:param name="pageclass" select="''"/>
    <xsl:param name="sequence" select="''"/>
    <xsl:param name="position" select="''"/>
    <xsl:param name="gentext-key" select="''"/>

    <fo:block>
      <xsl:choose>
        <xsl:when test="$position='left'">left</xsl:when>

        <xsl:when test="$position='center'">center</xsl:when>

        <xsl:when test="$position='right'">right</xsl:when>
      </xsl:choose>
    </fo:block>
  </xsl:template>
--- snap ---