Facebook-like JavaScript popup help
<p>If you look at the following screenshot:</p>

<p><img src="http://i.stack.imgur.com/xLrIx.png" alt="">
You will see a popup box <strong>(NOT THE MODAL)</strong> with some content that says 'Security Check' which is basically some helpful information that the user can invoke by clicking a link. I know how to create similar things using jQuery and simple HTML/CSS but looking at the Facebook example I have noticed that the help box <strong>IS NOT</strong> in the source...</p>

<p>Therefore it is being loaded in from somewhere else and then displayed to the user in the DOM... how would I create something similar?</p>

<p>Thanks</p>
