I don't get the error when testing it on my site. Try copying the code from here into a new page and test it.
Also, you may want to correct this line (//feed2.js is incorrect):
HTML Code:
<script language="JavaScript" src="http://feed2js.org//feed2js.php?src=http%3A%2F%2Frss.cnn.com%2Frss%2Fcnn_showbiz.rss&chan=title&num=7&desc=1" type="text/javascript"></script>