​x
 
<html>
<head>
<script type="text/javascript">
function closeWin()
  {
  myWindow.close()
  }
</script>
</head>
<body>
​
<script type="text/javascript">
myWindow=window.open('','','width=200,height=100')
myWindow.document.write("This is 'myWindow'")
</script>
​
<input type="button" value="Close 'myWindow'" onclick="closeWin()" />
​
</body>
</html>
​