1. Click a frameset
     pattern:

     2 Vertical
     3 Vertical
     2 Horizontal
     3 Horizontal
     3 Mixed
     4 Mixed

2. Copy and edit
     in this box:

     Copy/Edit
     Start again

     Clear all

     View it

3. Once you are satisfied, copy From <frameset> to </frameset> from the lower box and use for your own frameset.