Close javascript-popup-window from anywhere

Question

I\'m trying to build a popup that can be closed from anywhere.

On the Mainpage you have the option to open it. At any point while browsing the mainpage the user shall be

Answer 1

If you are trying to close it from an iframe...

top.my_window.close();

I believe you need to go out a level since that variable is set on the parent window. Not in the iframe.