I currently have a site calling iframes to show content. For some reason a background image that I have repeating-y, on firefox it doen't fullfill/touch the bottom of the browser, please visit the url below and scroll down all the way to the bottom to notice that the background image doesn't touch the bottom. It works good on IE though.
You can view each html page individually to see the code I'm using:
What could the problem be?