Changes position:absolute into fixed for footer.

Now this bug won't exist : http://puu.sh/3vL9T.png
![screen shot 2013-07-05 at 1 52 35 pm](https://f.cloud.github.com/assets/4388676/754974/f13bfd56-e59b-11e2-99e7-a0d8db05f1e5.png)