need help with a sticky footer with dropdown

hello everybody if got some problem with customizing my wordpress theme. I want to build a “stick” footer + the footer should be minimized, when a visitor click on a button. Sorry for my bad english, but to get an better idea of this, please visit this weblog: superlevel.de its exactly the thing i want to build. Im pretty much a rookie in coding, could you give me some hint with this? maybe some code snipped or a theme similar to this “dropdown-footer”.