Adding Amazon.com Universal Wish List Button

[rlfreshwater]

Information about it:
amazon.com/wishlist/vendor-button/ref=cm_wl_uwl_landing

I would like to add the universal wish list button. Amazon provides this code:

<script id="AddToAUWLButton" language="JavaScript1.2" type="text/javascript" src="http://www.amazon.com/gp/wishlist/bookmarklet/getbutton.js"> </script>

Is this possible to incorporate into ZenCart and if so can someone tell me where I would insert it (directory, file name and location in code)?

Thanks in advance.