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.
Frameset/Frame are among the list of options. Since you are using Struts another option is to use would be to use a <logic:present> on the same page. The use would have to be dependant on the end requirement, if I were to suggest.