[Javascript] Determining when a person leaves your domain

[jmays at websurveyor.com (Jessica Mays)]

Hi all,

In JavaScript is it possible to determine when a person leaves your
domain?  

I have a function that will go off on onunload that brings up an confirm
box that I can turn off if a person uses a link that I have a little bit
of JavaScript on.  But if the person uses their back button, address bar
to a local page, or refreshes the page it still goes off.

Goal: to be able to check if they are going to a page on your site (then
no confirm box) or off of your site (then a confirm would appear)

Thanks!

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Jessica Mays
Graphic Designer
WebSurveyor Corporation