As far as I can see, you've already handled the centering problem, haven't you? Although I'd recommend you make a page stretching to the browser width. This can be a little tricky, but if you manage, it would look awesome.
To do this, you must specify the table widths not in pixels, but in percents. I don't know if you can do that in a program you design your page in, but it's worth a look.
Reply here if you want to know more.
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