I can't view them in a browser either. I've just checked out my path settings and I can see on my Dreamweaver testing server I've missed out the www and so I think that's possibly caused my problem. The site URL is looking at looking at the www.mydomain and testing server on mydomain - which I know isn't good! I've changed it now and will try reloading the site to see if that fixes it.
Thanks for the help.