Sliding Panel

I’m looking for a plugin that will allow me to create a panel to be placed anywhere within my content that will allow the user to control its visibility right in place. So, the user would initially be presented with an icon/label. Clicking the icon/label would result in the panel sliding down (or some other animation) to reveal its contents. I hope that makes sense.

Can anyone point me to such a plugin? So far, the plugins I’ve found based on searching “WordPress plugin sliding panel” haven’t been what I’m looking for.

TIA,
David