Centering a divider in middle of page?

How do you center a divider in the middle of a page both vertically and horizontally so it's exactly in the middle of a browser?
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David S.Commented:
There are a few ways to do that. Each has its pros and cons.

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get the window size and find the middle and set the divider.

  var wide = window.screen.availWidth
  var high = window.screen.availHeight
Assume that the following is the divider:

<img src="divider.gif" style="width: 200px; margin-left:auto; margin-right:auto;" />

width is the width of your image and divider.gif is the path of the image on the server.
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