Class Diagrams

[Muhammad Asif]

Hi,
I have different packages in my solution and following struts framework. Can somebody guide me weather i have to make one "Super-Duper" class diagram, or I can also draw diagrams w.r.t each package ?

The latter seems better because it brings more clarity, however the problem is how do i show dependency between a class in Package A-B ? I understand i can show the package-package dependency ? But do i need to show the class-class dependecy as well or is it sufficient to document in the assumptions document?

Regards,