Thank you for your help and advice, and for stopping me before I expanded my unsuitable method any further – I’m always willing to learn. Also, I have removed your name as requested.
Don, I always try to make it so that visitors can view all the information on the main screen, so they don’t need to scroll down page after page; this is why I used ‘Enter’, so that the index of categories would be viewed on a new page, instead of scrolling down through reams of pages.
I agree that after reading your advice, that my outlay of categories – like steel, glass and iron, etc. - is far too complex, and is probably why I ended up working on it for so many hours.
I have taken your advice onboard and will work on creating a new outlay.
I will leave the present Virtual Museum up for now, though without adding further to it.
Cheers and thank you once again for your helpful advice,