http://brandeis.campusshirts.net/why.html

I want the random image to be centered like the one (not random generating) on my homepage here:

http://brandeis.campusshirts.net/

On the homepage image I've got the V and H space set at 4 which I think is what's centering the image up nicely in the cell. Is there a way I can apply the same V and H space settings in javascript to the random generating images?

Thanks,
Jacob