TheAppleNewsreel

I previewed my page in my browser, and found that the whole thing is on the left side of the page. How do I center it like the killersites page, and most other pages? Attached is a screenshot to give you an idea of what I'm talking about. Please note the large white area composing the right side of the screen.

I'm currently using Dreamweaver CS5 to do a complete overhaul of my site. Among the items I wanted to add to the new site is a JavaScript menu bar (which can be found in Adobe Exchange as Spry Menu Bar 2.0. I've inserted it into the page, and, as with a test page I tried with this menu bar, the menu bar in expanded form is the only thing that appears in design view. Upon previewing it in Safari I noticed that it's at the correct height, but it's aligned left. I wanted to align it center, but couldn't find the variable in the code to do so. My question is the following: Is there a way to align a JavaScript object in Dreamweaver (I'm still a novice; the previous version of my site was done in iWeb), and, on a separate, less important note, is it possible to display anything else in the design view when the menu bar is inserted.