How do I make an auto popup box for my website? : <p>I have looked everywhere to get a good popup box that auto pops up when the page loads but had no luck. I want a auto popup box that is centered and has overlay and that auto pops up. I want a popup box like this: <a href="http://imgur.com/A0NIPny" rel="nofollow">http://imgur.com/A0NIPny</a></p>

<p>Can you tell me the code for it and how to do it?? Sorry I'm kinda new at html and stuff but I know the basics and no I don't wanna use WordPress for this</p>
