This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The default "xhtml" theme uses table rows. Use the simple theme if you want to have complete control over your layout--but be aware you'll lose some functionality like showing error messages (which you can do manually).
That said, there's no reason to nest anything here.