CSS z-index Property

Hello,

I would like to do something this:

http://elamu.pl/show.html

Code (markup):

but I would like clickable links like here:

http://elamu.pl/show1.html

Code (markup):

How to do visual effect like first link and clickable links link second links?

I use z-index to hiding div social for div content but then links aren't clickable.

Thanks for help.

 

The links are click-able to me...

- Virtualize