If you want to have horizontal frames and vertical frames in the same page, you need to create frames within a frame. Frames that are grouped together are enclosed by their own border. This type of border is called a parent frameset. The border that encloses the entire grouping of frames on the page is called a root frameset.
To create frames within a frame:
Note You can change the vertical and horizontal orientations of all the frames in the root frameset or a parent frameset. See Changing the orientation of frames for more information.