I have been trying to create my own web gallery using Adobe's Web Photo Gallery (as it seem to be so easy to use). I have created my gallery and it all seems to work fine when testing on my desktop. However, once I upload the files I get the error "internal Server Error"
It's likely the script needs permissions changed on the server. I don't know of a method to do that using DW, so you'd probably have to connect using a regular FTP program or through shell, if you have it and know it's use.
If not permissions, it's possible the upload method needs to be changed to ASCII or BINARY, depending on which you tried first.