There are three scripts. One is combined, and the other two are just the menu and just the workspaces, so you can have them at different corners. They use xdotool to simulate the menu and change workspace button presses and should work under most environments (except probably compiz, because it's funny about virtual desktops).
Scripts here
You'll want to change the coordinates, the xdotool shortcuts and probably the colours. These are all at the top of the scripts.