Thanks Vaerli and Andy for your replies.
It is as I suspected. OK - I don't really see any problems with people nicking my own pics as I do not make my living from this and it can even be considered a form of compliment of someone likes them so much they would bother to nick them. However, when it comes to other photographers, I shall put a note about copyright on my page and I believe there is already a note under each of the pictures that are not mine to say who the photographer is and that should, hopefully, satisfy the photographers concerned. If not, they can contact me and we can come to an arrangement - I do have their agreement to post the pictures on my website so I do not anticipate any issues arising.
Thanks Andy for the references re Flash and also about .htaccess
I think I shall keep my website reasonably free of Flash as there is no need to include animation at the moment. Thanks for taking the trouble to post a reply.