You'll want to edit the CSS reference to #main_logo.
The current rule on your site is
#main_logo {style.css (line 55)
background:transparent url(http://dkpfiles.com/cod/logo) no-repeat scroll left top;
height:128px;
left:0;
position:absolute;
top:0;
width:600px;
}
You can change the location. Maybe by changing it to the following:
#main_logo {style.css (line 55)
background:transparent url(http://dkpfiles.com/cod/logo) no-repeat scroll center top;
height:128px;
left:0;
position:absolute;
top:0;
width:100%;
}
That'll center it for you. IF you want to make it taller, you'll want to change the height as well as change the "top" properties for
#header ul and the height for
#header.
--
It's all in the reflexes.