Hi all,
The majority of javascript errors that occur when using extensions is because of a cache file in dreamweaver that gets corrupt and messes everything up. The solution is to delete this file and restart dreamweaver and then everything should go according to plan.
See here for instructions: 146/
Many of have been told that Adobe has addressed this issue and it won't be a problem any longer in dreamweaver cs5 (fingers crossed).
Regards,
Brian