I don't know why you had to modify anything - the code works with links and/or map areas, which I presume is what you mean.
If you want to add more enabling links just give them suitable IDs and add them as further parameters:
linksEnableLink( 'http://youtube.com', 'lnk1', 'trig1', 'trig2', 'trig3', [B]'trig4', 'trig5'[/B] );
You can even set-up multiple independent link groups by making a separate call to linksEnableLink().
The parameter usage is:
linksEnableLink("URL of disabled link", "ID of disabled link", "ID of an enabling link" [, IDs of further enabling links] );
If you can't get it working, post your URL.