title: How to vertically align a div with varying height?
body: <p>I have a popup at <a href="http://roseannebarr.tumblr.com" rel="nofollow">MY PAGE</a> and I need the div that pops up to be vertically centered. There will be more, since it's Tumblr and the blog has different posts so the divs will vary in height. I need it to be centered VERTICALLY in the middle so the content expands upwards and downwards. Anyway this can be done?</p>