private function tobytes($val) {
		$val = trim($val);
		$last = fix_strtolower($val{strlen($val)-1});
		switch($last) {
			case 'g':
				$val *= 1024;
			case 'm':
				$val *= 1024;
			case 'k':
				$val *= 1024;
		}
		return $val;
	}