Thank you for this. I've downloaded the files and will have a play with them tomorrow. Too late to be doing it now!
I did try to copy the files to the folder in my site and was told by Windows that they were there. I assure you, they were not unless they were hidden. I used Windows Explorer to copy them to the page in the folder and they then did appear in DW. Weird goings-on!
I'll let you know how I get on.