Scroll bar appearing even when overflow is set to hidden?

I'm developing a website, http://m.vancouverislandlife.com/, and when a page is loaded, it's swapped in from the side, just like I want it to. However, when it's swapped in from the right, a scrollbar appears on the bottom. This happened when I switched from swapping the entire body to swapping only a specific element and apparently setting an explicit width and using overflow: hidden just isn't working. What am I doing wrong?

(The important script is 开发者_开发技巧swapp.js. Please visit the website in a WebKit browser.)

Apply

position: fixed;
height: 100%;
width: 100%;

to #content and that'll fix it.