Messed up footer

I recently upgraded a Themforest.net theme for a site I built (www.campbellscustoms.com). The upgrade involved a lot of porting over of custom CSS and such, and somehow in the process I’ve messed up the footer of the page, and I can’t for the life of me figure out what I’ve done. It seems like a </div> tag must be missing somewhere, because in firebug the footer highlights the entire page. Any suggestions?