Center a wrapper both horizonatl & vertical?

[pkng]

Hi!

As I wrote in the title I wonder how to write a style that place a wrapper in the middle of the screen in both horizontal and vertical?

To get it in the middel horizontal I use margin: 20px auto; but instead of having 20 px in the top I want it equal amount of space just like it get horizontal.

Thanks!

[Coyotelab]

Java Script

[pkng]

That answer don't help much!