Multiple Frames

I have a site with several frames, which is actually one site but we are
designing it to look like 3 seperate sites that are linked and share a
common user interface.  It uses frames, and my question is this.  The
interface frames except for the menu will not change regardless of the which
"site" the user is in.  When a user navigates within a "site" only one frame
will change.  When a user switches from one "site" to another three frames
will have to be changed.

I could do it rather easily by just calling a new frameset, but I would like
to find another way, that way the user does not have to sit through a
complete reload of the frameset.  Is there a way to change 2 or three frames
with one click?

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