I need to close all popup windows when the user exits the main page.
With my current code when user exits the main page after opening one popup the popup closes. But if I open both calculator window and help widow popups and exit the page, the popups don't close.

Here is my code:
//CALCULATOR Window
function calcWindow() {
var autoclose = true;
win = window.open("Calculator/SciCalc.htm",null,"height=300,width=350,status=yes,toolbar=no,menubar=no,location=no")
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
win.focus();
if (autoclose) { window.onunload = function(){win.close();}}
}

//HELP Window
function helpWindow() {
var autoclose = true;
win = window.open("/Help/Phoenix_Help/!SSL!/WebHelp/Phoenix_Help.htm",null,"height=500,width=550,status=yes,toolbar=no,menubar=no,location=no")
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
win.focus();
if (autoclose) { window.onunload = function(){win.close();}}
}