Without knowing what you have tried, its hard to say.
But Chris is right, this would be more HTML than JS.
Looking at the page, the images appear to be being set as backgrounds for the divs, so try background-position:center center; on the div.
However, your DIVs are really wide. Wider than your view-able area, so you may need to work to fix that too. There's no reason the divs need to be 1280px wide.
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Phil AKA Vacunita
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.
Web & Tech