The Potty Book --consisting of a "Henry" version for little boys, and a "Hannah" version for little girls--has been a very popular seller, as well as a godsend to moms and dads, ever since Barron's first published it a few seasons ago. Now, the humorous potty-training stories of Hannah and Henry are being reintroduced in a pair of DVDs that kids can watch on their TV. Parents of little girls will want this, the "Hannah" version. Hannah needs to have her diaper changed before she can go out and play. But Mom and Dad have just brought home a big package, and she's anxious to see what's inside.