Форма закза, поле индекс сделать обязательным

      <!-- Добавить этот код: -->
      
      <!-- Проверка формы -->
      <SCRIPT type="text/javascript" language="JavaScript">
         <xsl:comment>
            <xsl:text disable-output-escaping="yes">
               <![CDATA[
               $(document).ready(function()
               {
                  $("#address").validate({
                  rules: {
                     site_users_surname: {
                        required: true,
                        minlength: 2
                       },
                     site_users_name: {
                        required: true,
                        minlength: 2
                       },
                     site_users_email: {
                        required: true,
                        email: true
                     },
                     index: {
                        required: true,
                        minlength: 6
                     }
                  },
                  messages: {
                     site_users_surname: "Введите, пожалуйста, фамилию.",
                     site_users_name: "Введите, пожалуйста, имя.",
                     site_users_email: "Введите, пожалуйста, корректный e-mail.",
                     index: "Введите, пожалуйста, индекс.",
                  },
                  focusInvalid: true,
                  errorClass: "input_error"
               })
               });
               ]]>
            </xsl:text>
         </xsl:comment>
      </SCRIPT>
      
      <!-- / Конец добавления -->
      
      <form name="address" id="address" method="POST">

<?xml version="1.0" encoding="utf-8"?>
<!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="utf-8" indent="yes" method="html" omit-xml-declaration="no" version="1.0" media-type="text/xml"/>
   
   <xsl:template match="/locations">
      <!-- Строка шага заказа -->
      <ul class="shop_navigation gray">
      <li class="shop_navigation_current"><span>Адрес доставки</span>&#x2192;</li>
      <li><span>Способ доставки</span>&#x2192;</li>
      <li><span>Форма оплаты</span>&#x2192;</li>
      <li><span>Данные доставки</span></li>
      </ul>
      
      <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" style="width: 390px;" name="country" onchange="doSetLocation(this.options[this.selectedIndex].value, '{/locations/shop/path}cart/')">
                     <option value="0">..</option>
                     <xsl:apply-templates select="country"/>
                  </select>
                  <span class="red_star" style="position: relative; top: 4px;"> *</span>
               </td>
            </tr>
            
            <tr>
               <td>Область:</td>
               <td>
                  <xsl:variable name="country_id" select="/locations//country[@select = 1]/@id" />
                  
                  <select name="location" style="width: 390px;" 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>
                  <span class="red_star" style="position: relative; top: 4px;"> *</span>
               </td>
            </tr>
            <tr>
               <td>Город:</td>
               <td>
                  <select name="sel_city" style="width: 390px;" 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" style="width: 390px;" id="sel_city_area">
                     <option value="0">..</option>
                  </select>
               </td>
            </tr>
            <tr>
               <td style="vertical-align: middle;">Индекс:</td>
               <td>
                  <input type="text" size="5" class="large_input" style="width: 90px;" name="index" value="{external_propertys/site_users_postcode}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">Улица, дом, квартира:<br/>
               (город, район, если не выбраны)</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 390px;" name="full_address" value="{external_propertys/site_users_address}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">Фамилия, Имя, Отчество:</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 124px; margin-right: 5px;" name="site_users_surname" value="{external_propertys/site_users_surname}"/>
                  <input type="text" size="30" class="large_input" style="width: 124px; margin-right: 5px;" name="site_users_name" value="{external_propertys/site_users_name}"/>
                  <input type="text" size="30" class="large_input" style="width: 124px; margin-right: 5px;" name="site_users_patronymic" value="{external_propertys/site_users_patronymic}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">Компания:</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 390px;" name="site_users_company" value="{external_propertys/site_users_company}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">Телефон:</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 390px;" name="site_users_phone" value="{external_propertys/site_users_phone}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">Факс:</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 390px;" name="site_users_fax" value="{external_propertys/site_users_fax}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;">E-mail:</td>
               <td>
                  <input type="text" size="30" class="large_input" style="width: 390px;" name="site_users_email" value="{external_propertys/site_users_email}"/>
               </td>
            </tr>
            <tr>
               <td  style="vertical-align: middle;" >Комментарий к заказу:</td>
               <td>
                  <textarea rows="2" class="large_input" style="width: 390px;" name="description"></textarea>
               </td>
            </tr>
            <tr>
               <td>
                  <div class="gray_button">
                     <div>
                        <input name="step_2" value="Далее &#8594;" type="submit"></input>
                     </div>
                  </div>
               </td>
            </tr>
         </table>
      </form>
      
      <!-- Заполняем все дочерние элементы страны -->
      <SCRIPT type="text/javascript" language="JavaScript">
         var oldHandler=window['onload'];
         window['onload']=function(){if(typeof(oldHandler)=='function'){oldHandler();}newHandler();};
         function newHandler(){
         doSetLocation(document.getElementById('country').options[document.getElementById('country').selectedIndex].value, '<xsl:value-of select="/locations/shop/path" />cart/');
         }
      </SCRIPT>
      
   </xsl:template>
   
   <!-- Шаблон заполняет options для стран -->
   <xsl:template match="country">
      <xsl:choose>
         <!-- Если страна задана по умолчанию -->
         <xsl:when test="@select=1">
            <option value="{@id}" selected="selected" style="font-weight: bold;">
               <xsl:value-of disable-output-escaping="yes" select="name"/>
            </option>
         </xsl:when>
         <xsl:otherwise>
            <option value="{@id}">
               <xsl:value-of disable-output-escaping="yes" select="name"/>
            </option>
         </xsl:otherwise>
      </xsl:choose>
   </xsl:template>
   
   <!-- Шаблон заполняет options для местоположений (областей) -->
   <xsl:template match="location">
      <option value="{@id}">
         <xsl:value-of disable-output-escaping="yes" select="name"/>
      </option>
   </xsl:template>
   
   <!-- Шаблон заполняет options для городов -->
   <!--<xsl:template match="city">
      <option value="{@id}">
         <xsl:value-of disable-output-escaping="yes" select="name"/>
      </option>
   </xsl:template>-->
   
   <xsl:template match="city">
      
      <xsl:choose>
         <!-- Если страна задана по умолчанию -->
         <xsl:when test="@id=2391">
            <option value="{@id}" selected="selected" style="font-weight: bold;">
               <xsl:value-of disable-output-escaping="yes" select="name"/>
            </option>
         </xsl:when>
         <xsl:otherwise>
            <option value="{@id}">
               <xsl:value-of disable-output-escaping="yes" select="name"/>
            </option>
         </xsl:otherwise>
   </xsl:choose>   </xsl:template>
   
   <!-- Шаблон заполняет options для районов -->
   <xsl:template match="cityarea">
      <option value="{@id}">
         <xsl:value-of disable-output-escaping="yes" select="name"/>
      </option>
   </xsl:template>
   
</xsl:stylesheet>