How to implement this without refreshing the page?
<p>I don't know what this is called, so I recorded a video screenshot.</p>

<p><a href="http://imageshack.us/clip/my-videos/809/qg7.mp4/" rel="nofollow">http://imageshack.us/clip/my-videos/809/qg7.mp4/</a></p>

<p>I know it's javascript, but I have no idea what it's called, so I can't find a tutorial on how to replicate the process.</p>

<p>Is there a ready made plugin for jquery/javascript like this?</p>
