how do i add a button to hide a panel with buttons/displays?

Ok, i am working on a skin. this one actually
http://www.maj.com/gallery/bioman100/morestuff/wip.jpg
i want to have a button on one of the other white circles, that opens up a square window or whatever on the left, it dont have to be fancy just a fade in/out would be nice. it would have stuff like the track/time, playlist button, maby a small visualization window in it. i want all that on a panel that can disappear. can anyone explain how to do this?
thanks in advance.
http://www.maj.com/gallery/bioman100/morestuff/wip.jpg
i want to have a button on one of the other white circles, that opens up a square window or whatever on the left, it dont have to be fancy just a fade in/out would be nice. it would have stuff like the track/time, playlist button, maby a small visualization window in it. i want all that on a panel that can disappear. can anyone explain how to do this?
thanks in advance.