Firstly, avoid document.write(ln). It's old, old, old. Create an HTML element (span or div or something), give it an ID, and use innerHTML (or jQuery .html()) to populate it after it's created.
Secondly, the // at the beginning of the line is commenting out that line. Remove that, and the line should be enabled. But, again, refer to my "Firstly" comment.
If anyone knows of a website that can offer ColdFusion help that isn't controlled by neurotic, pedantic jerks* (stackoverflow.com), please PM me with a link.
* The neurotic, pedantic jerks are not the owners; just the people who are in control of the "popularity contest".