css idiot needs help

I am building a template with photoshop / imageready that I need to center on the page horizontally. No matter what I do, I cannot get it to center -- it is always justified to the left. I am sick of wasting time on this -- I need a CSS expert to look at this and fix it. I don't know if this is a "thirty dollar project," but it is the lowest-price project I can list. Feel free to bid less -- I have a feeling that this is a three-minute fix for someone who knows what they are looking at. You can see it live here: [login to view URL] Your fix must work in Explorer, FF and Chrome. Thanks for looking.