Rails - Jul 2006 - splitting a page into two

How do you perfectly allocate a page into two sides like this:

 -------------------
|         |         |
|         |         |
|         |         |
|         |         |
|         |         |
 -------------------

so that no matter how you resize the browser, each side will always have 
50% of their share.

I would like each side to have a different div id for ajax processing, 
as I will update one div sometimes and the other div some other time.

Thank you

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