Картинки для подкатегорий в выпадающем Каталоге

<xsl:template match="/shop">
      <div class="cd-dropdown-wrapper">
         <a class="cd-dropdown-trigger" href="#">Каталог</a>
         
         <nav class="cd-dropdown">
            <h2>Каталог</h2>
            <a href="#0" class="cd-close">Закрыть</a>
            
            <ul class="cd-dropdown-content">
               <xsl:apply-templates select="shop_group" />
            </ul>
         </nav>
      </div>
   </xsl:template>
   
<xsl:template match="shop_group">
      <li>
         <xsl:variable name="hasChildren" select="count(shop_group)" />
         <xsl:if test="$hasChildren">
         <!--<xsl:if test="image_small!=''">-->
            <xsl:attribute name="class">has-children</xsl:attribute>
         </xsl:if>
         
         <a href="{url}"><img src="{shop_group/dir}{shop_group/image_small}" alt=""/><xsl:value-of select="name"/></a>
         
         <xsl:if test="$hasChildren">
            <ul>
               <xsl:attribute name="class">
                  <xsl:choose>
                     <!-- Second Level -->
                     <xsl:when test="parent_id = 0">cd-secondary-dropdown is-hidden</xsl:when>
                  
                     <!-- Another Levels -->
                     <xsl:otherwise>is-hidden</xsl:otherwise>
                  </xsl:choose>
               </xsl:attribute>
               
            <li class="go-back"><a href="#0">Назад</a></li>
            
               <xsl:apply-templates select="shop_group" />
               
            </ul>
         </xsl:if>
      </li>
   </xsl:template>