How do vertically center a div?

I would like to vertically center my main content div. I开发者_StackOverflow社区 am open to using jQuery and/or CSS, but I'd prefer avoiding an extra wrapper div tag.

What do I need to do to do?

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jQuery:

$(document).ready(function() {
    $('#main').css('position', 'relative');
    $('#main').css('top', (($('#main').parent().height() - $('#main').height()) / 2) + "px");
});

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This question is basically the same as this one, which recommends the following article.

http://www.jakpsatweb.cz/css/css-vertical-center-solution.html