Реализация выпадающего меню на базе структуры сайта с помощью xsl-шаблона

<table id="header" width="999"  background="/images/index_03_1.jpg" height="40"  border="0" cellpadding="0" cellspacing="0" align="center">
   <tr>      
    <td width="4"><img src="/images/index_03_start.jpg" alt=""></td>
    <td height="40" width="100%"><?
$Structure = new Structure(); // Экземпляр класса Structure
$Structure->ShowStructure(0,'ВыпадающееМеню');
?></td>
<td ><img src="/images/index_03_3.jpg" width="207" height="40" alt=""></td>
    <td width="4"><img src="/images/index_03_end.jpg"  height="40" alt=""></td>
   </tr>
   </table>

<?xml version="1.0" encoding="windows-1251"?>
<!DOCTYPE xsl:stylesheet>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output xmlns="http://www.w3.org/TR/xhtml1/strict" doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
      encoding="Windows-1251" indent="no" method="html" omit-xml-declaration="no" version="1.0" media-type="text/xml" />
   
   <xsl:template match="/document">
      <table border="0" cellpadding="0" cellspacing="0">
         <tr>
            <xsl:apply-templates select="structure[show=1]"/>
         </tr>
      </table>
   </xsl:template>
   
   <xsl:template match="structure">
      
      <xsl:param name="posit" select="1" />
      
      
      <xsl:variable name="current_structure_id" select="/document/structure/current_structure_id"/>
      <xsl:if test="show_link = 1">
         <!-- Определяем адрес ссылки -->
         <xsl:variable name="link"><xsl:choose>
               <!-- Если внешняя ссылка -->
               <xsl:when test="is_external_link=1"><xsl:value-of disable-output-escaping="yes" select="external_link"/></xsl:when>
               <!-- Иначе если внутренняя ссылка -->
               <xsl:otherwise><xsl:value-of disable-output-escaping="yes" select="link"/></xsl:otherwise>
         </xsl:choose></xsl:variable>
         
         <!-- Определяем стиль вывода ссылки -->
         <xsl:variable name="link_style"><xsl:choose>
               <!-- Выделяем текущую страницу жирным (если это текущая страница, либо у нее есть ребенок с ID, равным текущей) -->
               <xsl:when test="current_structure_id=@id or count(.//structure[@id=$current_structure_id])=1">font-weight: bold</xsl:when>
               <!-- Иначе обычный вывод с пустым стилем -->
               <xsl:otherwise></xsl:otherwise>
         </xsl:choose></xsl:variable>
         
         <xsl:choose>
            <xsl:when test="level=0">
               <xsl:choose>
                  <xsl:when test="count(structure[show=1]) != 0">
                     
                     <td  valign="top" OnMouseOver="JavaScript:SlideLayer('id_{@id}');" OnMouseOut="JavaScript:SlideLayerHide('id_{@id}');" >
                        
                        <div>
                           <a href="{$link}" class="menu"><xsl:value-of select="name"/></a>
                        </div>
                        
                        
                        <div  style="display: none; z-index: 10; padding-right: 0; margin-top: 1px; margin-left: 0px; margin-right: 0px; position: absolute" id="id_{@id}">
                           
                           <table border="0" cellpadding="0" cellspacing="0" background="/images/index_3_01.jpg">
                              <xsl:variable name="posit_var" select="position()"/>
                              
                              <xsl:apply-templates select="structure[show=1]">
                                 
                                 <xsl:with-param name="posit" select="$posit_var"/>
                                 
                              </xsl:apply-templates>
                              
                           </table>
                        </div>
                     </td>
                     
                  </xsl:when>
                  <xsl:otherwise>
                     <td valign="top" align="center">
                        
                        <a href="{$link}" class="menu"><xsl:value-of select="name"/></a>
                        
                     </td>
                  </xsl:otherwise>
               </xsl:choose>
               
               
            </xsl:when>
            <xsl:otherwise>
               
               
               
               <td valign="top" ><a href="{$link}" class="menu"><xsl:value-of select="name"/></a>
               </td>
               
               
            </xsl:otherwise>
         </xsl:choose>
         
      </xsl:if>
   </xsl:template>
</xsl:stylesheet>

<?xml version="1.0" encoding="windows-1251"?>
<!DOCTYPE xsl:stylesheet>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output xmlns="http://www.w3.org/TR/xhtml1/strict" doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN" encoding="Windows-1251" indent="yes" method="html" omit-xml-declaration="no" version="1.0" media-type="text/xml"/>
   
   <xsl:template match="/document">
      <ul class="top_menu gray_link">
         <!-- Выбираем узлы структуры первого уровня -->
         <xsl:apply-templates select="structure[show=1]"/>
      </ul>
   </xsl:template>
   
   <xsl:template match="structure">
      
      <!-- Запишем в константу ID структуры, данные для которой будут выводиться пользователю -->
      <xsl:variable name="current_structure_id" select="/document/structure/current_structure_id"/>
      
      <li>
         <!--
         Выделяем текущую страницу добавлением к li класса red_li,
         если это текущая страница, либо у нее есть ребенок с атрибутом id, равным текущей uheggt.
         -->
         <xsl:if test="current_structure_id = @id or count(.//structure[@id=$current_structure_id]) = 1">
            <xsl:attribute name="class">red_li</xsl:attribute>
         </xsl:if>
         
         <div>
            <div>
               <!-- Показывать ссылку, или нет -->
               <xsl:choose>
                  <xsl:when test="show_link = 1">
                     <!-- Определяем адрес ссылки -->
                     <xsl:variable name="link">
                        <xsl:choose>
                           <!-- Если внешняя ссылка -->
                           <xsl:when test="is_external_link = 1">
                              <xsl:value-of disable-output-escaping="yes" select="external_link"/>
                           </xsl:when>
                           <!-- Иначе если внутренняя ссылка -->
                           <xsl:otherwise>
                              <xsl:value-of disable-output-escaping="yes" select="link"/>
                           </xsl:otherwise>
                        </xsl:choose>
                     </xsl:variable>
                     <!-- Ссылка на пункт меню -->
                     <a href="{$link}" title="{name}"><xsl:value-of disable-output-escaping="yes" select="name"/></a>
                  </xsl:when>
                  <!-- Если не показывать ссылку - выводим просто имя ссылки -->
                  <xsl:otherwise>
                     <xsl:value-of disable-output-escaping="yes" select="name"/>
                  </xsl:otherwise>
               </xsl:choose>
            </div>
         </div>
      </li>
   </xsl:template>
</xsl:stylesheet>

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