css javascript loader addon problems

[saplanet]

<?php
/**
 * Common Template - tpl_header.php
 *
 * this file can be copied to /templates/your_template_dir/pagename<br />
 * example: to override the privacy page<br />
 * make a directory /templates/my_template/privacy<br />
 * copy /templates/templates_defaults/common/tpl_footer.php to /templates/my_template/privacy/tpl_header.php<br />
 * to override the global settings and turn off the footer un-comment the following line:<br />
 * <br />
 * $flag_disable_header = true;<br />
 *
 * @package templateSystem
 * @copyright Copyright 2003-2006 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: tpl_header.php 3392 2006-04-08 15:17:37Z birdbrain $
 */
?>
<!--bof-header logo and navigation display-->
<?php
if (!isset($flag_disable_header) || !$flag_disable_header) {
?>
<div id="headerWrapper" class="clearfix">
  <?php
  if (SHOW_BANNERS_GROUP_SET1 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET1)) {
    if ($banner->RecordCount() > 0) {
?>
<div id="bannerOne" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
?>
  <div id="headerWrappera">
    <div id="headerWrapperb">
      <div id="headerWrapperc">
        <!--bof-navigation display-->
        <div id="navMainWrapper" class="clearfix">
          <div id="navMain">
            <div id="navMainLinks">
              <ul class="back">
                <li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><?php echo HEADER_TITLE_CATALOG; ?></a></li>
                <?php if ($_SESSION['customer_id']) { ?>
                <li><a href="<?php echo zen_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGOFF; ?></a></li>
                <li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a></li>
                <?php
      } else {
        if (STORE_STATUS == '0') {
?>
                <li><a href="<?php echo zen_href_link(FILENAME_LOGIN, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGIN; ?></a></li>
                <?php } } ?>
                <?php if ($_SESSION['cart']->count_contents() != 0) { ?>
                <li><a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a></li>
                <li><a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CHECKOUT; ?></a></li>
                <?php }?>
              </ul>
            </div>
            <div id="navMainSearch">
              <?php require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?>
            </div>
          </div>
        </div>
        <!--eof-navigation display-->
        <!--bof-branding display-->
        <div id="logoWrapperOuter">
          <div id="logoWrapper">
            <div id="logo"><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">' . zen_image($template->get_template_dir(HEADER_LOGO_IMAGE, DIR_WS_TEMPLATE, $current_page_base,'images'). '/' . HEADER_LOGO_IMAGE, HEADER_ALT_TEXT, HEADER_LOGO_WIDTH, HEADER_LOGO_HEIGHT) . '</a>'; ?></div>
            <?php if (HEADER_SALES_TEXT != '' || (SHOW_BANNERS_GROUP_SET2 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET2))) { ?>
            <div id="taglineWrapper">
              <?php
              if (HEADER_SALES_TEXT != '') {
?>
              <div id="tagline"><?php echo HEADER_SALES_TEXT;?></div>
              <?php
              }
?>
              <?php
              if (SHOW_BANNERS_GROUP_SET2 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET2)) {
                if ($banner->RecordCount() > 0) {
?>
              <br class="clearBoth" /><div id="bannerTwo" class="banners"><?php echo zen_display_banner('static', $banner);?></div>
              <?php
                }
              }
?>
            </div>
            <?php } // no HEADER_SALES_TEXT or SHOW_BANNERS_GROUP_SET2 ?>
          </div>
        </div>
        <!--eof-branding display-->
        <!--eof-header logo and navigation display-->
        <!--bof-header ezpage links-->
        <?php if (EZPAGES_STATUS_HEADER == '1' or (EZPAGES_STATUS_HEADER == '2' and (strstr(EXCLUDE_ADMIN_IP_FOR_MAINTENANCE, $_SERVER['REMOTE_ADDR'])))) { ?>
        <div id="navEZPagesTopWrapper">
          <?php require($template->get_template_dir('tpl_ezpages_bar_header.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_ezpages_bar_header.php'); ?>
        </div>
        <?php } ?>
        <!--eof-header ezpage links-->
        <!--bof-optional categories tabs navigation display-->
        <?php require($template->get_template_dir('tpl_modules_categories_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_categories_tabs.php'); ?>
        <!--eof-optional categories tabs navigation display-->
      </div>
    </div>
  </div>
</div>
<?php } ?>

I am using 1.39d, and using custom template. I tried to merge the existing html_header.php (shown here is from my template), but couldn't seem to be doing the right thing, my page turns out blank.

Appreciate anyone who might know where what and where to change?