How do I change this skin setting?

[adamskiii]

I want my skin to take up the whole page of my site but when users go to it this is what they get:
http://i251.photobucket.com/albums/gg285/lambo_2161/untitled3.jpg

The skin is there but there are gaps on the left and right side. The forum is centered and I dont want this. How do I edit this setting so that these gaps get filled in by stretching the skin?

thanks

[Lynne]

Look under your Style Manager > find style > StyleVars. The top section has variables for the 'gaps' and the width.