Help with toggling of overlay

JavaScript
1

I have three buttons, and each can toggle the overlay. I want to be able to toggle the overlay if you click a button, BUT if the overlay is visible when i click another of the buttons, I want it to stay open.

Click two times on of the buttons = toggle the overlay on and off.
Click on a button one time and then clicking another = keep the overlay visible until you click the last clicked button again.

Can anyone help me with this?

2

if the buttons do not have any other functionality that should be availably while the toggle is on, you can disable all other buttons.

3