app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Abstract config form element renderer
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_System_Config_Form_Field
    extends Mage_Adminhtml_Block_Abstract
    implements Varien_Data_Form_Element_Renderer_Interface
{

    /**
     * Enter description here...
     *
     * @param Varien_Data_Form_Element_Abstract $element
     * @return string
     */
    protected function _getElementHtml(Varien_Data_Form_Element_Abstract $element)
    {
        return $element->getElementHtml();
    }

    /**
     * Enter description here...
     *
     * @param Varien_Data_Form_Element_Abstract $element
     * @return string
     */
    public function render(Varien_Data_Form_Element_Abstract $element)
    {
        $id = $element->getHtmlId();

        $html = '<tr><td class="label"><label for="'.$id.'">'.$element->getLabel().'</label></td>';

        //$isDefault = !$this->getRequest()->getParam('website') && !$this->getRequest()->getParam('store');
        $isMultiple = $element->getExtType()==='multiple';

        // replace [value] with [inherit]
        $namePrefix = preg_replace('#\[value\](\[\])?$#', '', $element->getName());

        $options = $element->getValues();

        $addInheritCheckbox = false;
        if ($element->getCanUseWebsiteValue()) {
            $addInheritCheckbox = true;
            $checkboxLabel = Mage::helper('adminhtml')->__('Use website');
        }
        elseif ($element->getCanUseDefaultValue()) {
            $addInheritCheckbox = true;
            $checkboxLabel = Mage::helper('adminhtml')->__('Use default');
        }

        if ($addInheritCheckbox) {
            $inherit = $element->getInherit()==1 ? 'checked="checked"' : '';
            if ($inherit) {
                $element->setDisabled(true);
            }
        }

        $html.= '<td class="value">';
        $html.= $this->_getElementHtml($element);
        if ($element->getComment()) {
            $html.= '<p class="nm"><small>'.$element->getComment().'</small></p>';
        }
        $html.= '</td>';
        if ($addInheritCheckbox) {

            $defText = $element->getDefaultValue();
            if ($options) {
                $defTextArr = array();
                foreach ($options as $k=>$v) {
                    if ($isMultiple) {
                        if (is_array($v['value']) && in_array($k, $v['value'])) {
                            $defTextArr[] = $v['label'];
                        }
                    } elseif ($v['value']==$defText) {
                        $defTextArr[] = $v['label'];
                        break;
                    }
                }
                $defText = join(', ', $defTextArr);
            }

            // default value
            $html.= '<td class="use-default">';
            //$html.= '<input id="'.$id.'_inherit" name="'.$namePrefix.'[inherit]" type="checkbox" value="1" class="input-checkbox config-inherit" '.$inherit.' onclick="$(\''.$id.'\').disabled = this.checked">';
            $html.= '<input id="'.$id.'_inherit" name="'.$namePrefix.'[inherit]" type="checkbox" value="1" class="checkbox config-inherit" '.$inherit.' onclick="toggleValueElements(this, Element.previous(this.parentNode))" /> ';
            $html.= '<label for="'.$id.'_inherit" class="inherit" title="'.htmlspecialchars($defText).'">'.$checkboxLabel.'</label>';
            $html.= '</td>';
        }

        $html.= '</tr>';
        return $html;
    }

}

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