PHP Implementation click on the navigation menu to change only the bottom content module

PHP Implementation click on the navigation menu to change only the following content module
Want to do a navigation interface above, there is an area, this area, I would like to click on the different navigation menu in the column, dynamic display of different PHP pages, which way to use it?
A lot of people say they use IFRAME, but I've tried it a few times.
It's more intuitive! ：

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I can think of 3 ways:
1. Use frameset, i.e. frame structure.
2.ajax to achieve
3.ifame to achieve
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