Request: JS Popunder Code

Hi all,

I'm wondering if someone could give me a little help in creating a popunder script like on this site torrentz.ws

The popunder get's activated by clicking any of the links on the site and only displays once. I've seen a lot of sites displaying ads or doing traffic exchange this way but I can't really find any working code for this.

Any help is greatly appreciated

Thanks a lot!

Btw: I'm so glad I found this forum, lot's of cool stuff...