<html>
<head>
<script>
var myWindow;
function openWin()
{
myWindow=window.open("","","width=400,height=200");
}
function closeWin()
{
if (myWindow)
{
myWindow.close();
}
}
function checkWin()
{
if (!myWindow)
{
document.getElementById("msg").innerHTML="'myWindow' has never been opened!";
}
else
{
if (myWindow.closed)
{
document.getElementById("msg").innerHTML="'myWindow' has been closed!";
}
else
{
document.getElementById("msg").innerHTML="'myWindow' has not been closed!";
}
}
}
</script>
</head>
<body>
<input type="button" value="Open 'myWindow'" onclick="openWin()">
<input type="button" value="Close 'myWindow'" onclick="closeWin()">
<br><br>
<input type="button" value="Has 'myWindow' been closed?" onclick="checkWin()">
<br><br>
<div id="msg"></div>
</body>
</html>