jQuery popup the easy way

Here is a fast and easy way to create jQuery popup.

What does this code do?

At the loading of the page, I create a div as wide as the window. This div is a bit transparent. Then I hide it. I also take care to its z-index value to be sure it is behind all elements.

Then when we click on a div of class code, I copy the content into this new wide div, and I show it. Really simple but really efficient. No need to use a jQuery plugin.