Thanks for your reply Tim.
I have done that, but when I re-select the original index.htm page it does the same again.
I am linking my pages to a template, but in the site map there is, for example an index page linking to an information page, which then links to the index page, which then links to the information page and so on. you could keep clicking the plus symbols all day long, and the list would just keep expanding!
And worse, there is nothing in the help file(for once) that informs you as to how to deal with it.