<script>function newwin() {
var newwin = window.open("http://javascript.ru", "JSSite", "width=420, height=230, resizable=yes, scrollbars=yes, status=yes");
return newwin;
}
function test(win) {
return alert( win.closed ? 'closed' : 'not closed' );
}
</script>
<div onclick="newwindow = newwin();">Open</div>
<div onclick="test(newwindow);">Test</div>