Edit HTML to bring back website

Hi There, i was recently editing the HTML on the about us page of our Magento website from the front end. Unfortunately i have created the following error; Whoops, it looks like you have an invalid PHP version. Magento supports PHP 5.3.0 or newer. Find out how to install Magento using PHP-CGI as a work-around. '; exit; } /** * Compilation includes configuration file */ define('MAGENTO_ROOT', getcwd()); $compilerConfig = MAGENTO_ROOT . '/includes/[login to view URL]'; if (file_exists($compilerConfig)) { include $compilerConfig; } $mageFilename = MAGENTO_ROOT . '/app/[login to view URL]'; $maintenanceFile = '[login to view URL]'; if (!file_exists($mageFilename)) { if (is_dir('downloader')) { header("Location: downloader"); } else { echo $mageFilename." was not found"; } exit; } if (file_exists($maintenanceFile)) { include_once dirname(__FILE__) . '/errors/[login to view URL]'; exit; } require MAGENTO_ROOT . '/app/[login to view URL]'; require_once $mageFilename; #Varien_Profiler::enable(); if (isset($_SERVER['MAGE_IS_DEVELOPER_MODE'])) { Mage::setIsDeveloperMode(true); } ini_set('display_errors', 1); umask(0); /* Store or website code */ $mageRunCode = isset($_SERVER['MAGE_RUN_CODE']) ? $_SERVER['MAGE_RUN_CODE'] : ''; /* Run store or run website */ $mageRunType = isset($_SERVER['MAGE_RUN_TYPE']) ? $_SERVER['MAGE_RUN_TYPE'] : 'store'; Mage::run($mageRunCode, $mageRunType); I need somebody to log into the root and bring the website back please.