Load the div content when that div is seen/reached while scrolling
<p>On the jQuery documentation pages, I notice that the Disqus comments do no open until I scroll to that part of the page.</p>

<p>Scroll down the bottom of this page and you'll notice the affect: <a href="http://api.jquery.com/child-selector/" rel="nofollow">http://api.jquery.com/child-selector/</a></p>

<p>I was wonder how this was done as I would like to use it on my website as it will help reduce the page loading time.</p>
