I would like to have a button in my footer. When you click

Hi! I would like to have a button in my footer. When you click the button, the footer slides up, and shows some additional content.

To make the links and the form won't be a problem, what I wonder is: How would I make the transition easiest?

The actual site is here: stilius.se/fageras

Here is the picture before: http://imgur.com/r3AkUzF

And here after: http://imgur.com/O976iPj

Thanks in advance!

/Stilius