Captivate 6.0 had a Javascript-related bug. Seems like it is not resolved in 6.1.
You can read more about the issue here:
http://www.cpguru.com/warning-adobe-captivate-6-and-javascript-bug/
Send an email to Wish-Captivate@macromedia.com to get the patch for this. The patch is not available for direct download.