div+css

排版如下:
 -------------------------------
|            A                  |
--------------------------------
|                       |    C  |
|                       |       |
|       B               |-------|  |----------
|                       |  D    |  |    F    |
|                       |       |  |         |   f的可以浮动的
|-------------------------------|  |----------
|              E                |
|-------------------------------|页面如何写div和css文件，效果我作出来了，但是受到div顺序影响.  譬如我把某个div的id为A的放在第一个就出问题!-----------------------------------
|     C        |  E     |    B    |
|              |        |         |
|--------------|        |         |
|      D       |        |         |
|              |        |         |
|              |--------|         |
|              |  F     |         |
|              |        |         | 
|              |        |         |
|              |        |         |
|---------------------------------|
|            A                    |
|---------------------------------|           哪位大侠帮我写下行不？我今天去面试了，这排版做出来了，但是我自已觉得不行，因为我把div的顺序改变一下，格局就受影响了