Header display problematic in IE

[Xaria]

My header is not displayed correctly in IE. It's fine in Firefox.

here is my tpl_header

<?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 4813 2006-10-23 02:13:53Z drbyte $
 */
?>

<?php
  // Display all header alerts via messageStack:
  if ($messageStack->size('header') > 0) {
    echo $messageStack->output('header');
  }
  if (isset($_GET['error_message']) && zen_not_null($_GET['error_message'])) {
  echo htmlspecialchars(urldecode($_GET['error_message']));
  }
  if (isset($_GET['info_message']) && zen_not_null($_GET['info_message'])) {
   echo htmlspecialchars($_GET['info_message']);
} else {

}
?>


<!--bof-header logo and navigation display-->
<?php
if (!isset($flag_disable_header) || !$flag_disable_header) {
?>

<div id="headerWrapper">
<!--bof-navigation display-->
<div id="navMainWrapper">
<div id="logowrapper">
<div id="navMain">
<ul class="back">
<li>    <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) . '</a>'; ?></div></li>

<li><?php echo HEADER_TITLE_SEARCH ;
require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?></li> 

<?php if ($_SESSION['customer_id']) { ?>
    <li><a href="<?php echo zen_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGOFF; ?></a></li>
<?php    }
    else{ ?>  
    <li><a href="<?php echo zen_href_link(FILENAME_LOGIN, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGIN; 
    }?></a></li>
    <?php if (!($_SESSION['COWOA'])) { ?>
    <li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a></li><?php } ?>
    <!--<li><a href="<?php //echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php //echo HEADER_TITLE_MY_ACCOUNT; ?></a></li>-->

</ul>
<br class="clearBoth" />
</div>

</div>
<div id="navHeader">
<ul>
<li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><?php echo HEADER_TITLE_CATALOG; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_CONDITIONS, '', 'SSL'); ?>"><?php echo HEADER_TITLE_ABOUT; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_CREATE_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CREATE_ACCOUNT; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_PAGE_4, '', 'SSL'); ?>"><?php echo HEADER_TITLE_SERVICES; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_CONTACT_US, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CONTACT; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_PAGE_3, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CAREERS; ?></a></li>
</ul>
</div>

<br class="clearBoth"/>
</div>
<!--eof-navigation display-->
<!--eof-header logo and navigation display-->

<!--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-->

<!--bof-header ezpage links-->
<?php if (EZPAGES_STATUS_HEADER == '1' or (EZPAGES_STATUS_HEADER == '2' and (strstr(EXCLUDE_ADMIN_IP_FOR_MAINTENANCE, $_SERVER['REMOTE_ADDR'])))) { ?>
<?php require($template->get_template_dir('tpl_ezpages_bar_header.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_ezpages_bar_header.php'); ?>
<?php } ?>
<!--eof-header ezpage links-->
</div>
<?php } ?>

Thanks

[dbltoe]

When something is not displaying correctly, it's normally a stylesheet problem rather than a php file problem.
And, display problems are best addressed by giving us a link to the site.

[Nimbuz]

Clear your floats.

Use <div style="clear:both;"><!-- --></div> after the floats.