Right Side of Blog Cut Off

I’ve had this problem before but it was never solved.

My blog is located at https://www.scottandtelly.com. In some browsers, the right side where a page flip graphic would be is cut off. It makes the page look really bad.

My HTML is mostly validated, except for a few minor things (nothing I think would affect the page layout). Does anyone know what is wrong? Is it just the browser being shit?

The browser I use (and looks fine in) is Firefox 2.