Code for closing the browser with the help of a button?

<!-- Start of Close Browser Script -->
<!-- When the "Close Window" button is clicked, this script
	will close the browser window that the webpage is in.
-->
<script language="JavaScript">
<!--

function closeIt() {
  close();
}

// -->
</script>

<center>
<form>
<input type=button value="Close Window" onClick="closeIt()">
</form>
</center>

<!-- End of Close Browser Script -->
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