passing info. to the upper frame

[hellraiser24]

I'm using frames in a page. The lower frame(login.asp)
is the login page. When the user logs on, I want to pass the username and password to the upper frame(header.asp) to verify them. If valid, display the navigation tabs on the upper frame. But how do I pass the info to the upper frame
and have that reload itself to display the tabs?

Thanks in advance.