Second of two consecutive call-template instructions

Hi all,

This is a section of a stylesheet I'm working on to convert a simple
custom markup to XHTML.  The section essentially deals with a line
such as:

  <photo name="beach" ppos="right" cpos"below" caption="Wish you weren't here!" />

where 'ppos' indicates the position of the photo on the page, and
'cpos' indicates the presence of a caption as well as its position.
Details of the images themselves are included much lower down in the
XML source like so:

  <images>
  .
    <image name="beach">
      <desc>Sunny day on beach</desc>
      <width>300</width>
      <file>images/beach.jpeg</file>
      <flickr>http://static.flickr.com....</flickr>
    </image>
  .
  </images>

If a 'cpos' attribute is specified, but no 'caption' attribute, then
the caption is the description found in <desc> element.  Captions are
optional and not all of the images have flickr addresses.

Basically, my problem is this.  If I comment out the four lines I've
marked with an asterix, the stylesheet processes the source without
any problems whatsoever (and does exactly what I want).  With these
four lines present however, I get the following error at the point
indicated.

  "The variable 'name' is not defined"

This seems very strange to me, and needless to say I can't figure out
why it is.  I am simply trying to wrap an <img> element in an anchor
if the image has a flickr address and then write the caption below the
image (in the containing <div>).

Any help much, much appreciated, as always.

sdt.

  * All the variables are defined by this point in the stylesheet *

  <xsl:choose>
    <xsl:when test="$cpos!=''"><!-- there's a caption which requires a surrounding div -->
      <div class="{$class}" style="{concat('width:',/page/images/image[@name=$name]/width,'px')}">
        <xsl:call-template name="does-image-flickr" />
*       <xsl:call-template name="write-caption">
*         <xsl:with-param name="cpos"><xsl:value-of select="$cpos" /></xsl:with-param>
*         <xsl:with-param name="caption"><xsl:value-of select="$caption" /></xsl:with-param>
*       </xsl:call-template>
      </div></xsl:when>
    <xsl:otherwise><!-- or there isn't -->
      <xsl:call-template name="does-image-flickr" />
    </xsl:otherwise>
  </xsl:choose>

  <xsl:template name="does-image-flickr">
    <xsl:choose><!-- photo is a flickr link -->
      <xsl:when test="/page/images/image[@name=$name]/flickr">   <-- "The variable 'name' is not defined"
        <a href="{/page/images/image[@name=$name]/flickr}">
          <xsl:call-template name="pass-image-params" />
      </a></xsl:when>
      <xsl:otherwise><!-- or it isn't-->
      <xsl:call-template name="pass-image-params" /></xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <xsl:template name="pass-image-params">
    <xsl:apply-templates select="/page/images/image[@name=$name]">
      <xsl:with-param name="cpos"><xsl:value-of select="$cpos" /></xsl:with-param>
      <xsl:with-param name="caption"><xsl:value-of select="$caption" /></xsl:with-param>
      <xsl:with-param name="class"><xsl:value-of select="$class" /></xsl:with-param>
    </xsl:apply-templates>
  </xsl:template>

  <!-- images -->
  <xsl:template match="//image">
    <xsl:param name="cpos" />
    <xsl:param name="caption" />
    <xsl:param name="class" />
    <xsl:element name="img">
      <xsl:attribute name="alt"><xsl:choose><!-- alt attribute defaults to desc -->
        <xsl:when test="$caption!=''"><xsl:value-of select="$caption" /></xsl:when>
        <xsl:otherwise><xsl:value-of select="desc" /></xsl:otherwise>
      </xsl:choose></xsl:attribute>
      <!-- src attribute -->
      <xsl:attribute name="src"><xsl:value-of select="file" /></xsl:attribute>
      <!-- class attribute required if no caption and hence no containing div -->
      <xsl:if test="$cpos=''">
        <xsl:attribute name="class"><xsl:value-of select="$class" /></xsl:attribute>
      </xsl:if>
    </xsl:element>
  </xsl:template>

  <xsl:template name="write-caption">
    <xsl:param name="cpos" />
    <xsl:param name="caption" />
    <xsl:if test="$cpos='below'"><br /></xsl:if>
    <xsl:if test="$cpos!=''"><!-- caption-position specified -->
      <xsl:choose><!-- but no caption specified, use desc as default -->
        <xsl:when test="$caption!=''"><xsl:value-of select="$caption" /></xsl:when>
        <xsl:otherwise><xsl:value-of select="desc" /></xsl:otherwise>
      </xsl:choose>
    </xsl:if>
  </xsl:template>