hmm, I have mixed feelings about this. Certainly if you are a coder and if the template is done well using standard coding "rules", you would be fine. I am concerned about your tool though because Dreamweaver is a WSIWYG editting tool that often goes off and does its own "code" that the user doesn't see. I am an old school ASP developer and I use a very simple editor called HomeSite, which gives me direct access to the code itself.
I suppose if you bought or had the template made that was created in Dreamweaver and it came with some good notes on how the template is structured you would be fine. I have purchased javascripts in the past and after long hours I was able to persevere and make them do what I needed.
I guess in a roundabout way I think you have to either 1. know how to code (and at that point you would write it yourself) or 2. have alot of patience and an aptitude for coding and then it will be a great project for you.