Script That Will Close Other Tabs - Windows - When Goes To Same Site To Sign On

Imagine a wife has signed on to a web site in a browser tab. She does not sign off and walks away to do something else. Her husband sits at the computer and seeing her signed on, opens a new tab and tries to sign on to the same site.

I am trying to write a script that will close other tabs/windows when the husband goes to the same site to sign on.

So, on the sign on page (or even better, the sign off page), when the sign on button is clicked, a piece of Javascript code is run first. The javascript simply goes through all tabs on the browser, and checks to see if any such tabs has an HTML document that came from the same domain as the sign on page. If such tabs exist, then before POSTing the user name and password to the server, the Javascript code will close those tabs that contain HTML documents came from the same domain.

So, I understand I need to set the window.name to a specific value. But does anyone know what the code on the sign on/sign off page to close the other tabs/windows would look like?