problem with the css , help please

hello

i was working on design new style for games script called onarcade

and i want to stretch it , i mean i want to make the script width full screen

in the script one css file and i had a try with it but i failed

so u can download the script from here

http://www.zshare.net/download/14849983ecd99b03/

and here is example for the script with the original width

http://games.s11w.com/

and here is other example for the script after stretch it and after making the width full screen

http://qss.bdr130.net/

so help me please and thanks every body