/**
  * Return header html for fieldset
  *
  * @param Varien_Data_Form_Element_Abstract $element
  * @return string
  */
 protected function _getHeaderHtml($element)
 {
     if ($element->getIsNested()) {
         $html = '<tr class="nested"><td colspan="4"><div class="' . $this->_getFrontendClass($element) . '">';
     } else {
         $html = '<div class="' . $this->_getFrontendClass($element) . '">';
     }
     $html .= $this->_getHeaderTitleHtml($element);
     $html .= '<input id="' . $element->getHtmlId() . '-state" name="config_state[' . $element->getId() . ']" type="hidden" value="' . (int) $this->_getCollapseState($element) . '" />';
     $html .= '<fieldset class="' . $this->_getFieldsetCss($element) . '" id="' . $element->getHtmlId() . '">';
     $html .= '<legend>' . $element->getLegend() . '</legend>';
     $html .= $this->_getHeaderCommentHtml($element);
     // field label column
     $html .= '<table cellspacing="0" class="form-list"><colgroup class="label" /><colgroup class="value" />';
     if ($this->getRequest()->getParam('website') || $this->getRequest()->getParam('store')) {
         $html .= '<colgroup class="use-default" />';
     }
     $html .= '<colgroup class="scope-label" /><colgroup class="" /><tbody>';
     return $html;
 }