Detect before/when the browser leaving to another webpage

When a JApplet is loaded and the browser browse to another webpage the applet (the main JFrame) is closed without a warning.  Can a I detect that it in advance to prevent the browser from leaving the webpage or at least warn the user or so?
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s_lavieAsked:
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TimYatesCommented:
add onLoad and onUnload javascript to the webpage...

That will fire javascript when the page is loaded, and when they leave the page...

You can't stop them leving though, so what you want to do isn't possible :-(
TimYatesCommented:
ie:

<body onLoad="alert( 'Hi!' )" onUnload="alert( 'Bye!' )">
s_lavieAuthor Commented:
Can I issue a yes/no dialog that the user can regret before the browser leaves the webpage?
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TimYatesCommented:
There is

onBeforeUnload

but it is only available in Internet Explorer

http://www.webreference.com/dhtml/diner/beforeunload/index.html

----------------

<SCRIPT LANGUAGE="JavaScript1.2" TYPE="text/javascript">
<!--
function unloadMess(){
    mess = Leaving so soon?"
    return mess;
}

function setBunload(on){
    window.onbeforeunload = (on) ? unloadMess : null;
}

setBunload(true);
//-->
</SCRIPT>
s_lavieAuthor Commented:
I'm quite weak with JavaScript.  I'd appreciate if you add a sample code that includes the yes/no dialog and the canceling of moving to another webpage,
10x
TimYatesCommented:
<html>
    <head>
        <title>Tim's cool test!</title>

        <SCRIPT>
        <!--
            function unloadMess()
            {
                mess = 'Leaving so soon?' ;
                return mess;
            }

            function setBunload(on)
            {
                window.onbeforeunload = (on) ? unloadMess : null;
            }

            function pageLoaded()
            {
                alert( 'Setting the beforeUnload handler (IE ONLY)' ) ;
                setBunload(true);
            }

            function pageClosed()
            {
                alert( 'Closing the page' ) ;
            }
        //-->
        </SCRIPT>

    </head>
    <body bgcolor="#FFDDFF" onload="javascript:pageLoaded()" onUnload="javascript:pageClosed()">
        <a href="http://www.google.com">Go to google</a><br/>
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    </body>
</html>

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TimYatesCommented:
Mmmmm.....pink ;-)
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