Видимо так.
//Время просмотра ссылки
$timer = isset($_POST['ask_timer']) ? (int)$_POST['ask_timer'] : 5;
$timer_arr = array('5' => 5, '10' => 10, '15' => 15, '20' => 20, '30' => 30, '40' => 40, '50' => 50, '60' => 60);
if (!isset($timer_arr[$timer])) { echo '<span class="msgbox-error">Ошибка данных</span>'; return; }
правь вот эту таблицу поле `timer`
CREATE TABLE IF NOT EXISTS `db_serfing` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(30) NOT NULL,
`time_add` int(11) NOT NULL DEFAULT '0',
`title` varchar(55) NOT NULL,
`desc` varchar(55) NOT NULL,
`url` varchar(255) NOT NULL,
`timer` enum('5','10','15','20','30','40','50','60') NOT NULL DEFAULT '5',
`move` enum('0','1','','') NOT NULL DEFAULT '0',
`high` enum('0','1','','') NOT NULL DEFAULT '0',
`speed` enum('1','2','3','4','5','6','7') NOT NULL DEFAULT '1',
`baner` enum('0','1','','') NOT NULL,
`baner_url` varchar(250) NOT NULL,
`crev` enum('0','1','','') NOT NULL DEFAULT '0',
`view` int(11) NOT NULL DEFAULT '0',
`price` double(10,2) NOT NULL DEFAULT '0.00',
`money` double(10,2) NOT NULL DEFAULT '0.00',
`status` int(1) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=cp1251 AUTO_INCREMENT=1 ;