Insert the part between the lines:
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<form>
<input type="image" value="Close Window" onClick="window.close()">
<img src="INSERT.jpg">
</form>
<a href="javascript:window.close()">Close Window</a>
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Also change the name of the image (named here as "INSERT.jpg") as needed and it's location correct! I also attached a close button for you to use, also I would like to credit Javascript Kit for the code without the image that I modified for you and myself to include an image as the button, here's the link: javascriptkit.com/script/script2/closewin.shtml