try 
	{
		$result = $db->prepare (" INSERT INTO `gategories` (`name`) value (:categoryName) ");
		$result -> bindParam (':categoryName', $_POST['newCategory']);
		$result -> execute();
	} catch (PDOException $e)
		{
			throw new myException ("Can't insert new category into DB");
		}

$q = 'INSERT INTO `gategories` (`name`) value ("'. $_POST['newCategory'] .'";');