You could try something like this
Where test2.html is your popup obviously. If its open and focus is set to the parent window the popup will close.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<a href="test2.html" onClick="openWin(this.href);return false">Test</a>
That would go in the head tags of the parent page. Hmm an error is thrown when the user goes from a normal application like MS Word and back to the page.
This may only happen locally, I'll upload the test files to my server and check. Yeah that happens on my server as well, only in IE though.
The callee (server [not server application]) is not available and disappeared; all connections are invalid. The call did not execute.