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switch($right_frame_file) {    case 'right_main.php':        $right_frame_url = "right_main.php?mailbox=".urlencode($mailbox)                       . (!empty($sort)?"&sort=$sort":'')                       . (!empty($startMessage)?"&startMessage=$startMessage":'');        break;    case 'options.php':        $right_frame_url = 'options.php';        break;    case 'folders.php':        $right_frame_url = 'folders.php';        break;    case 'compose.php':        $right_frame_url = 'compose.php?' . $mailtourl;        break;    case '':        $right_frame_url = 'right_main.php';        break;    default:        $right_frame_url =  urlencode($right_frame);        break;}