[Plugin: NextGEN Gallery] How do I change size of pictures?

Hi All,
Well I had to update my theme when I went to 2.7 and I now get a scrollbar on the page when looking at an individual page. Where and how do I change this to be a bit smaller to get rid of the scrollbar? You can see it here:
http://mikedeanellis.com/picture-albums?album=4&gallery=16&pid=457