How to center my new design?

I want to center my new design: www.limainfinita.com/p/
I used dreamweaver and all is made using layouts.
I want that nomatter what kind of resolution are you using my design be centered.

I did read about a script to detect screen resolution but had no luck finding.
another way is convert layout to table but i dont know how to do that( I tried)

any idea how to center my design?
thanks