I think your missing the point. The text is going to be encrypted in and then decrypted in the external JS. The append style parameters are just to show that nothing is in the html/js besides that.
<p id="eid_id"></p> <script type="text/javascript" src="http://www.leoreavidar.com/js/email.js>; </script> <script> window.onload = function() { appendStyle("dXNlcm5hbWU=","ZG9tYWlu","Y29t") }; </script>