simg:getWidth just returns $nominal.image.width

hi,

i tried to use the variable $intrinsicwidth in graphics.xsl, but
simg:getWidth just fills it with the value of its second param
$nominal.image.width.
and this is not because the xsl:otherwise condition is used, due to debug i
placed a xsl:message directly into the first xsl:when.
the img-files are found and $filename is filled correctly.


<xsl:variable name="intrinsicwidth">
    <!-- This funny compound test works around a bug in XSLTC -->
    <xsl:choose>
      <xsl:when test="$use.extensions != 0 and $graphicsize.extension != 0">
        <xsl:choose>
          <xsl:when test="function-available('simg:getWidth')">
            <xsl:value-of
select="simg:getWidth(simg:new($filename),$nominal.image.width)"/>
        ...
          <xsl:otherwise>
            <xsl:value-of select="$nominal.image.width"/>
          </xsl:otherwise>
        ...

any pointers?

thx
-seb