Нужно что бы форма логин и пароль были в дизайне сайта.

<script type="text/javascript" src="/hostcmsfiles/ajax/JsHttpRequest.js"></script>
<script type="text/javascript" src="/hostcmsfiles/ajax/ajax.js"></script>
<script type="text/javascript" src="/hostcmsfiles/main.js"></script>

<?php
$SiteUsers = & singleton('SiteUsers');

$user_id = $SiteUsers->GetCurrentSiteUser();

if ($user_id > 0) {

$row = $SiteUsers->GetSiteUser($user_id);

}
else {
?>


<!--  Форма -->
<div class="red_grad">
               <div class="tl"></div>
               <div class="tr"></div>
               <div class="bl"></div>
               <div class="br"></div>
              
                    
               <div id="SiteUserMessage"></div>
              
               <p>
                  <form class="form_to_main" action="/users/" method="POST" enctype="multipart/form-data">
                     Пользователь:
                     <input name="site_user_login" type="text">
                     Пароль:
                     <input name="site_user_password" type="password">
                     <input class="button" type="submit" name="apply" value="Войти" onclick="return AjaxSendForm(fCallBackSiteUser, '&action=ajax', this)">
                  </form>
               </p>
               </div>
              
               <script type="text/javascript">
               /**
               * Функция обратного вызова при авторизации пользователя
               */
               function fCallBackSiteUser(responseJS)
               {
                  if (typeof responseJS != 'undefined')
                  {
                     if (typeof responseJS.message != 'undefined')
                     {
                        var oDivMessage = document.getElementById('SiteUserMessage');

                        if (oDivMessage)
                        {
                           oDivMessage.innerHTML = responseJS.message;
                        }
                     }

                     if (typeof responseJS.content != 'undefined')
                     {
                        var oDiv = document.getElementById('SiteUser');

                        if (oDiv)
                        {
                           oDiv.innerHTML = responseJS.content;

                           // Выполняем скрипты из полученного с сервера HTML-а
                           runScripts(oDiv.getElementsByTagName('SCRIPT'));
                        }
                     }
                  }
               }
               </script>
            </div>

<!--  Форма конец  -->

<?php
}
?>


<?php
$SiteUsers = & singleton('SiteUsers');

$user_id = $SiteUsers->GetCurrentSiteUser();

if ($user_id > 0) {

$row = $SiteUsers->GetSiteUser($user_id);
print_r($row['site_users_login']);

echo(' &nbsp; &nbsp;<a href="/users/">Личный кабинет</a> &nbsp; &nbsp;<a href="/users/?action=exit">Выход</a>');

}

else {

echo('<a href="/users/">Авторизация</a> &nbsp; &nbsp;<a href="/users/registration/">Регистрация</a>');

}
?>