See image for example. This happens in IE8 and Opera 10.62 (I didn't test other browsers). Basically, if your browser window is not wide enough, the footer is a bit broken when you scroll.
I suggest the following solution instead of George's:
This preserves the current behavior of the footer stretching page wide while still fixing the bug.
I have found the problem and the solution.
Notice the addition of
This forces the bottom bar to be the same width as the rest of the page.
Update: It is also necessary to include:
in the style parameter. This centers the bar along the bottom.