You can use my stylesheet:
Code:
#menu { float: left; width: 130px; }
#content { float: left; padding-left: 7px; width: 526px; margin-left: 4px; }
I think that's the code which centers MY site, you may have to edit it to fit your site.
It uses a menu to the left and the "content" of the site to the right, use it as:
Code:
<div id="menu">menu here...</div>
<div id="content">page content here</div>
And remember that it uses float so when you want to break it to float another item on your site, you must use:
Or as i use it:
Code:
.floatbreak { clear:both; }
Some simple CSS knowledge and for the next time, there's a lot of information about this on the web,

//Zeelia