I'm in the middle. This is a simple demonstration of a cross browser way of centering content of known dimensions, by positioning the top left corner in the middle of the browser (top:50%; left:50%;), and then setting the margins to negative values representing 1/2 of the element height and width. This method only works if you know the dimensions of the element.
It uses min-width in modern browsers and expressions in IE6 to stop the content from disappearing off the left or top of the page. The yellow background on body will only be visible in lt IE7