Hello Thelma,
Thank you for responding to my post. The course I'm doing is the "Web Design 1" course for beginners - video tutorial.
I looked at the link you posted in your reply and I think I have the same problem as "hellohereisjim" (copied below) in that my four pages are all named .html, (ie. tutorial_tables.html) but when you look at the properties of the page, its' page name is "tutorial_tables.html.html" . Is this where the error lies Thelma?, I don't know how to change this, simply renaming the page without the ".html" file exrension does not alter the properties page name - still ".html.html".
Another question Thelma,what part of the Doctype am I missing and what is the relevance? . . please don't laugh too loudly!! us newbies can be of a sensitive disposition !