close browser window in java script

var arrWindowRefs = [];
//... assume many references are added to this array - as each window is open...
//Close them all by calling this function.
function CloseSpawnedWindows() {
   for (var idx in arrWindowRefs)
      arrWindowRefs[idx].close();
}

<script language="javascript">
function closewindow()
{
window.close();
;
}
 </script>

<a href="javascript:self.close()">Close the window</a>

<script language="JavaScript" type="text/javascript">
function closeW()
{
window.opener = self;
window.close();
}

</script>