<!--
    The one thing that is unique concerning both of these scripts
    is that we need to make sure that we are closing the "top" window.
    
    You could also use the the following link with an image instead
    of the text string.
-->
<p><a href="javascript:top.close()">Close Window</a></p>

<!--
    The form button implementation ties into the "onclick" event.
-->
<form>
  <input type="button" onclick="top.close()" value="Close Window" name="button1">
</form>