app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Import.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)
 */


/**
 * Custom import CSV file field for shipping table rates
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_System_Config_Form_Field_Import extends Varien_Data_Form_Element_Abstract
{

    /**
     * Enter description here...
     *
     * @param array $data
     */
    public function __construct($data)
    {
        parent::__construct($data);
        $this->setType('file');
    }

    /**
     * Enter description here...
     *
     * @return string
     */
    public function getElementHtml()
    {
        $html = '';

        $html .= '<input id="time_condition" type="hidden" name="'.$this->getName().'" value="'.time().'" />';

        $html .= <<<EndHTML
        <script type="text/javascript">
        Event.observe($('carriers_tablerate_condition_name'), 'change', checkConditionName.bind(this));
        function checkConditionName(event)
        {
            var conditionNameElement = Event.element(event);
            if (conditionNameElement && conditionNameElement.id) {
                $('time_condition').value = '_' + conditionNameElement.value + '/' + Math.random();
            }
        }
        </script>
EndHTML;

        $html .= parent::getElementHtml();

        return $html;
    }

}

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