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.
i had a requirement like this in one of my projects.
i can suggest two methods:
1) get a reference to the last row and use cloneNode.
something like : pass the ref to the last node from where you are calling the method