[R] graphics layout

[Murali.Menon at avivainvestors.com]

Folks,

I'm battling the layout() functionality in graphics, and getting a bit mixed up. I'd like to create subscreens like so:

 _________ _________
|         |         |
|    1    |    2    |
|_________|________ |
|         |         |
|    3    |    4    |
|_________|_________|
|         |____6____|
|    5    |____7____|
|_________|____8____|


Note that subscreens 1:5 are the same size, and 6,7,8 are the same width as, say, 1, but of one-third the height.

How to achieve this? 

Thanks,

Murali