Facebook comment box not resizing

Hi
I'm using ver 7.0.3 and trying to get the Facebook comment box to resize. I've tried setting it at 100% and also 500px within the admin/ content Plugin - Comments but it still doesn't change the size of the comment box frame.

Here is how the box is shown on the website. It goes across the right column modules.
www.drumhellermail.com/news/28890-pet-tu...-missing-for-50-days

Also, the comment box doesn't show up in Firefox.