HOWTO: Add css for IE within zen-cart

1) Prepare a css file for IE, called ie7.css, located in /includes/templates/template_default/my

2) Add the following codes:
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echo '<!--[if lte IE 7]><link rel="stylesheet" href="' . $template->get_template_dir('.css',DIR_WS_TEMPLATE, $current_page_base,'my') . '/ie7.css" />'."\n".'<![endif]-->';
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around the following codes in /includes/templates/template_default/common/html_header.php
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/**

 * load all template-specific stylesheets, named like "style*.css", alphabetically

 */

  $directory_array = $template->get_template_part($template->get_template_dir('.css',DIR_WS_TEMPLATE, $current_page_base,'css'), '/^style/', '.css');

  while(list ($key, $value) = each($directory_array)) {

    echo '<link rel="stylesheet" type="text/css" href="' . $template->get_template_dir('.css',DIR_WS_TEMPLATE, $current_page_base,'css') . '/' . $value . '" />'."\n";

  }
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