Twitter Popup Login Window

I'm currently trying to look at Twitter's code to see how they created their popup login window within the same pa开发者_StackOverflowge. I wanted to know if anyone knew how to create something like this or could point me in different directions? I've already tried using Google but with no real luck.

Here's a tutorial: http://aext.net/2009/08/perfect-sign-in-dropdown-box-likes-twitter-with-jquery/ Hope this helps you!

What you want is commonly referred to as a Lightbox. There are many examples revealed through search engines.