Javascript - Child window events

[fizch]

Is there an event for a child window closing? I need to know when the child window closes so that I may perform some actions on the parent.

[fredmv]

<script type="text/javascript">
//<![CDATA[
var w = open();

with(w.document)
{
write('<h1>child</h1>');
close();
}

w.onunload = function() { alert('child window closed'); }
//]]>
</script>