Issue with CSS margins in IE 8

Can someone tell me why in this link:

A margin shows up in firefox 3.6.x but there is no margin in IE 8?
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s8webConnect With a Mentor Commented:
You need a DocType. Try putting this as your very first line (above your html tag).

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

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