фильтр на доске объявлений.

<SCRIPT type="text/javascript" language="JavaScript">
         <xsl:comment>
            <xsl:text disable-output-escaping="yes">
               <![CDATA[
               location_select_id = "location";
               city_select_id = "sel_city";
               cityarea_select_id = "sel_city_area";
               ]]>
            </xsl:text>
         </xsl:comment>
      </SCRIPT>
      
      <form name="address" id="address" method="POST">
         <h1>Адрес доставки</h1>
         <p>
            <a href="{shop/path}cart/">Корзина</a>
         </p>
         <table>
            <tr>
               <td>Страна:</td>
               <td>
                  <select id="country" name="country" onchange="doSetLocation(this.options[this.selectedIndex].value, '{/locations/shop/path}cart/'">
                     <xsl:apply-templates select="country"/>
                  </select>
               </td>
            </tr>
            
            <tr>
               <td>Область:</td>
               <td>
                  <xsl:variable name="country_id" select="/locations//country[@select = 1]/@id" />
                  
                  <select name="location" id="location" onchange="doSetCity(this.options[this.selectedIndex].value, '{/locations/shop/path}cart/'">
                     <option value="0">..</option>
                     <xsl:apply-templates select="location[@parent = $country_id]"/>
                  </select>
               </td>
            </tr>
            <tr>
               <td>Город:</td>
               <td>
                  <select name="sel_city" id="sel_city" onchange="doSetCityArea(this.options[this.selectedIndex].value, '{/locations/shop/path}cart/'">
                     <option value="0">..</option>
                     <xsl:apply-templates select="city[@parent = location[@parent = $country_id]]"/>
                  </select>
               </td>
            </tr>
            <tr>
               <td>Район города:</td>
               <td>
                  <select name="sel_city_area" id="sel_city_area">
                     <option value="0">..</option>
                  </select>
               </td>
            </tr>
            <tr>
               <td>Индекс:</td>
               <td>
                  <input type="text" size="5" name="index" value=""/>
               </td>
            </tr>
            <tr>
               <td>Улица, дом, квартира:<br/>
               (город, район, если не выбраны)</td>
               <td>
                  <input type="text" size="30" name="full_address" value=""/>
               </td>
            </tr>
            <tr>
               <td>
                  <input name="step_2" value="Далее &gt;&gt;" type="submit"></input>
               </td>
            </tr>
         </table>
      </form>