I was afraid you were going to ask that as I don't remember the specifics. I think what I did though was not put the div in the footer area but put it in ATO>Add HTML/CSS Inserts>HTML Inserts: Body Bottom and then style accordingly. Something like
<div id="fauxfooter">Footer Content</div>
I decided to do a quick search of the forum as well as I knew this had been dealt with and came up with this thread
that has some code examples.
As you can see there are often several ways a particular issue can be addressed.