Margin auto does not seem to work in IE

Solution:

Verify that you have the right DOCTYPE. 

This is what a DOCTYPE  looks like
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

Well it you do not specify a DOCTYPE, IE automatically uses quirks mode and quirks mode apparently does not support auto-magin centering.

http://ycsoftware.net/difference-between-quirks-mode-and-strict-mode/
http://www.quirksmode.org/css/quirksmode.html

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