Changing The Title Bar Content Of Window.open

I've got a link that launches a little AJAX application in a window.

Like this:

function launchListener()
{
var newWindow = window.open("listener.php", "newWindow",
"width=300,height=150");
}

Ideally, once this window is loaded, it will sit in the background and
wait for stuff to happen. I would like to then change the title bar to
denote changes. Simple enough, right?

Anyway, problem is: When the new window launches, its title is not
exactly what I assign it in "listener.php" (for instance, "Listener"),
but rather "http://155.55.55.55 - Listener" (or whatever). This means
that while sitting the taskbar, generally all the user is going to see
is a domain name and some dots, rather than what I want them to see.