Fixed WordPress Footer Widgets for Sparkling Theme

Hi,

We use your sparkling theme as our parent theme.

How do we get the footer fixed?

Please see our problem here:
http://student.mtstudent.se/~vt15_imd13_grp01/wordpress/borja-trana/

Also, the buttons don’t seem to work in firefox even though we have used the code you should for firefox: CSS Hacks Targeting Firefox | CSS-Tricks

Any suggestions?

Thank you for your help!