Thanks to both of you who responded- the w3 validator is a very useful
resource I didnt know of. How do I find out why someone 1 starred my
post- too long? Point taken about the images.
I had used generated code from this very convenient site (
http://www.roundedcornr.com/) but had misunderstood how it worked- the
images provide only a finite coverage of the area. Can change them
easily enough now I know.
SOLVED - Not stylesheet issue