I am having some issues with a site that I am building and it expanding the width of the browser. For instance, if my browser window is set to 1500px, a scrollbar will appear at the bottom allowing you to scroll right. Once you scroll right the site is cut off and there is only white space. The site should be 100% and the content is 960px with a 10px padding on the left and right. Here is my example:

http://brookelynperry.com/dev/

Any suggestions?