Thanks...I tried that approach by replacing with the CSS file from my archived file of 12 Dec. Only difference it made is that the formated "Navigation" material now appears in "Centre" format rather than the former Left-Justified.
I am on dial-up so will visit local Internet Cafe [High Speed] in a couple of hours to try some more. If no success, I will likely cut-and-paste from Archive into a new web site. Will likely require less time to corect that I have spent 'experimenting.'
Ken: HTML and CSS are written in American not English. If you used the expression "centre" anywhere it will not be recognised, you have to write "center".